leak in water pipe under shower tray

Hello. I have a 1976 Tradewind based in the UK. Was recommissioning after winter yesterday and a water pipe (probably the hot water pipe) has sprung a leak under the shower tray in the rear bathroom. The tray is the original an all-in-one-fibreglass piece with built in seat. I wondered if anyone knew how I could access the pipes without removing the tray as I am sure it will split when trying to remove it. Thanks.