A Welsh MP claimed more than £2,500 to pay her utility bills.
Conservative MP Virginia Crosbie who represents Ynys Mon claimed £2,634.12 in 2020-21 in utilities.
The other two Welsh MPs with the highest amounts were Conservative Preseli Pembrokeshire MP Stephen Crabb who claimed £1,476.74 in the same year. Plaid Cymru's Dwyfor Meirionydd MP Liz Saville Roberts claimed £1,120.41.