The Rail, Maritime and Transport union (RMT) members at 14 companies and Network Rail again walked out on Friday, crippling services across the country, a day after an unprecedented nursing strike.
However, some planned strikes have also been called off in recent days. Members of the Transport Salaried Staffs Association (TSSA) union at Network Rail have voted to accept the firm's pay offer, it was announced on Thursday.
And a planned 72-hour strike from Friday by ground handling staff at Heathrow Airport was suspended by Unite after private contractors Menzies made an improved pay offer. Planned strikes by security guards on Eurostar on Friday and Sunday have also been suspended after contractor Mitie made a fresh pay offer, the RMT has said.
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Despite this, services ranging from postal deliveries to health services are still set to be hit by walkouts from now going into February.
Here are some of the strikes planned:
December 17
Rail workers at Avanti West Coast will continue their strike.
The Driver and Vehicle Standards Agency (DVSA) strike continues for staff in Scotland and Northern Ireland.
National Highways workers continue their walkout in the North West, North East and Yorkshire.
The RMT rail workers' walkout continues.
December 19
Staff working at the Department for Work and Pensions (DWP) start strike action. More than 200 PCS members in three DWP offices in Liverpool and one in Doncaster will walk out on dates from December 19 to 31 - although it is unclear which dates.
Unite members working for Highlands and Islands Airports will strike, affecting 11 small hubs in Scotland.
DVSA driving examiners to strike in the North West, Yorkshire and Humber and North Wales.
Rural Payments Agency (RPA) staff resume their walkout.
December 20
RCN members will stage another nurses' strike.
The DVSA strike continues in the North West, Yorkshire and Humber and North Wales.
RPA staff continue their walkout.
Unison workers at the Environment Agency refuse to provide "on call" cover for unexpected incidents.
December 21
Ambulance workers and other NHS staff will stage a strike in England co-ordinated by the GMB, Unison and Unite.
In a separate dispute in Scotland, strikes by ambulance staff and some NHS workers have been called off after members of Unison and Unite voted to accept the Scottish Government's most recent pay deal.
The DVSA strike continues in the North West, Yorkshire and Humber and North Wales.
RPA staff continue their walkout.
December 22
Railway cleaners across the country with the RMT union to launch a strike.
National Highways workers begin a walkout in London and the South East.
Unite members working for Highlands and Islands Airports will stage another strike.
RMT Eurostar security staff could stage a walkout, depending on the outcome of a members vote on the latest pay offer from contractor Mitie.
The DVSA strike continues in the North West, Yorkshire and Humber and North Wales.
RPA staff continue their walkout.
Unison workers at the Environment Agency refuse to provide "on call" cover for unexpected incidents.
December 23
Royal Mail workers will walk out in another day of national strike action.
The RMT railway cleaners' national strike continues.
RMT Eurostar security staff could stage a walkout.
The National Highways workers' strike continues in London and the South East.
The DVSA strike continues in the North West, Yorkshire and Humber and North Wales.
PCS members in Border Force start a wave of strikes, including December 24, 25, 26, 28, 29, 30 and 31.
December 24
RMT railway workers will stage another strike from 6pm on Christmas Eve.
Royal Mail workers to continue national strike action.
The DVSA strike continues in the North West, Yorkshire and Humber and North Wales.
Unison staff at Environment Agency refuse to volunteer to attend incidents.
December 25
The RMT rail strike will continue, although no train services run on Christmas Day.
Unison staff at Environment Agency refuse to volunteer to attend incidents.
December 26
The RMT rail strike will continue, meaning limited Boxing Day services are likely to be cancelled.
TSSA members at operator CrossCountry are also set to strike on Boxing Day.
Unison staff at Environment Agency refuse to volunteer to attend incidents until 9am.
December 27
The RMT rail strike continues until 6am.
The TSSA strike at CrossCountry will continue.
December 28
NHS staff in the GMB union will stage another strike.
The DVSA driving examiners' strikes will start in the West Midlands, the Eastern region and the East Midlands.
TSSA members working for Great Western Railway (GWR) and West Midlands Trains (WMT) to strike from 12pm.
December 29
The DVSA strike continues in the West Midlands, Eastern region and East Midlands.
TSSA strikes at GWR and WMT continue.
December 30
Road strikes by National Highways employees will begin in the West Midlands and South West.
The DVSA strike continues in the West Midlands, Eastern region and East Midlands.
December 31
RMT railway cleaners will stage another strike.
Road strikes by National Highways employees will begin in the West Midlands and South West.
Unison staff at Environment Agency refuse to volunteer to attend incidents.
January 1
National Highways workers to stage two-day action in all areas of the country.
The DVSA strike continues in the West Midlands, Eastern region and East Midlands.
Unison staff at Environment Agency refuse to volunteer to attend incidents.
January 2
Unison staff at Environment Agency refuse to volunteer to attend incidents until 9am.
January 3
RPA staff will resume their walkout.
January 4
The DVSA driving examiners' strike starts in London, the South East, South Wales and the South West.
The RMT rail workers' strike continues.
UK-wide National Highways strike continues.
RPA staff will continue their walkout.
January 5
The DVSA strike continues in London, South East, South Wales and South West.
RPA staff continue their walkout.
January 6
RMT rail workers will stage another 48-hour strike.
National Highways workers to stage a two-day action in the East Midlands and eastern England.
The DVSA strike continues in London, South East, South Wales and South West.
RPA staff to continue their walkout.
January 7
The RMT rail workers' walkout continues.
National Highways workers will continue their strike in the East Midlands and eastern England.
The DVSA strike continues in London, South East, South Wales and South West.
January 8
The DVSA strike continues in London, South East, South Wales and South West.
January 9
The DVSA strike continues in London, South East, South Wales and South West.
RPA staff continue their walkout.
January 10
The Educational Institute of Scotland (EIS) teachers' union will stage a national strike in primary schools, special schools and early years sites.
The DVSA strike continues in London, South East, South Wales and South West.
RPA staff continue their walkout.
January 11
EIS, joined by the Scottish Secondary Teachers' Association, will stage another national strike, in secondary schools and secondary special schools.
RPA staff will continue their walkout.
January 12
RPA staff continue their walkout.
January 13
RPA staff continue their walkout.
January 16
EIS to stage a national strike for 16 consecutive days until February 2, which will see members in two local authorities strike each day.
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