Thanks for the responses, fellas.
Ron...I know both those suppliers...and the bungalow in Lychett. I have contacted them, but they didn't respond. If I don't source something elsewhere , I'll try again. We are back in Wareham in a fortnight for 3 weeks.
I know the Charles family well. Frank put my new centre window in last year. His business address in Poole has been re-occupied by another business, and Frank is freelance now. I have his latest business card here. If I could source a shower tray, and could not fit it, I would probably get Frank in.
Thanks for the numbers, also.

Thanks, Al...these caravan shower trays are all different.....made for the model, I think.

Thanks, Alfie, I will give them a ring.

I think the shower tray only screws in, but it is on two levels, and the toilet sits on the top level. If it is easy to remove the toilet, I think I could do the tray. But if I foul up, swmbo will feed me to the lions

I know we have a 'caravan man' on here, is it Henry

?