It looks a nice sturdy classic craft... I like a bit of orange with varnished wood. Transom wheels are pretty impressive! 1980s do you think? Is the outboard a Suzuki 16?
I assume you've seen the makers website... Survitec Group » Brands » Eurovinil
and their reference to spares availability... Survitec Group » Support » Spare Parts
and this page for service/repair branches which gives a couple of places in the south of England if you refine to UK and Rescue Boat Repairs... Survitec Group » Services
See if you can make anything of this thread re E3 valves (Click on Google translate assuming that option is shown for you)... Sostituzione valvole Eurovinil E3