Fish temporary holding tank

Does anyone have a fish temporary holding tank in the Sleaford/ Grantham area Lincolnshire that I could borrow or buy ? Im 74 & recently bought a cottage where 30 fish had been abandoned and survived last summers drought without filtered water or any care & need to reline the pond. It needs to hold 30 goldfish & be transportable. Needed urgently. Buy a swimming pool 10 ft are cheap euro parts sell them Ive got a big vat im in March