With the Queen set to 'lie-in-state' over the next seven days, members of the public will be allowed to say goodbye to the country's longest reigning monarch.
But doing so will involve strict bag checks and astonishingly long queues.
Queen Elizabeth's coffin was brought to Palace of Holyroodhouse in Edinburgh on Sunday, where it will remain until it is brought down to London on Tuesday.
There, her closed casket will lie in state at Westminster Hall until Sunday, September 18, before Monday's funeral.
Members of the public are welcome to pay their respects, but have been told to expect queues as long as 30 hours in which people are not allowed to bring chairs.
The government has issued guidance on all the things you are allowed to do and bring for those wishing to pay their respects.
When, where and how you can see the Queen's coffin
Westminster Hall will be opened to the public to view her coffin from 5pm on Wednesday.
It will be open 24 hours a day until it closes at 6.30am on Monday 19 September.
Anyone can attend and mourners are able to simply show up and join the queue, although strict airport-style security checks will be carried out.
You can leave your tributes to Queen Elizabeth II here
How to queue
Thousands are expected to flock to Westminster to pay their respects, but the queues are expected to be exceedingly long, lasting through the night with little opportunity to sit down as it continues to move.
For that reason, the government has warned people to think very carefully before bringing children.
You will also need to leave plenty of time, so make sure you have no important commitments to attend.
Make sure to dress suitably for the weather and to bring a portable power bank too, to keep your phone charged.
Due to the crowds expected, commuters have been warned there may be delays on public transport around Westminster.
Details of the queue's route will be published at 10pm on Tuesday.
What you can and can't bring
Much like boarding a plane, there are restrictions on what you can bring with you to see the lying-in-state, including the size of your bag.
Each person is allowed one small bag no bigger than 40cm x 30cm x 20cm, with one simple opening or zip so you can move quickly through the security check.
A bag drop is available at the start of the queue for bigger luggage, although space is not guaranteed.
While mourners are encouraged to bring food and drinks as sustenance during the heavy queues, these will have to be gone in time to see the coffin.
Here is a list of all items banned from being brought into Westminster Hall:
- Flasks or water bottles, except clear water bottles. Clear water bottles must be emptied of their contents before you enter the security search point at the Palace of Westminster.
- Food and liquid of any kind. Any food or liquids must be consumed in the queue or disposed of before you enter the security search point at the Palace of Westminster.
- Flowers or other tribute items (including candles, soft toys and photographs). These items can't be taken into or left in the Palace of Westminster. Floral tributes only should be taken to the dedicated floral tribute area in Green Park.
- Sharp items, including knives, Swiss Army knives, scissors, cutlery and screwdrivers.
- Personal defence equipment or any object that could be used as a weapon and/or compromise public safety, including personal defence sprays.
- Paint sprays, padlocks, chains, climbing gear, and dangerous or hazardous items.
- Fireworks, smoke canisters, air-horns, flares, whistles, laser devices, and other items that could be used to cause a disturbance or noise.
- Banners, placards, flags, advertising or marketing messages, and other similar items that could be used to cause a disturbance.
- Coolers, hampers, sleeping bags, blankets, folding chairs and camping equipment.
- Non-foldable pushchairs.
- Any other items as directed by security staff or police.
