Hi Guys
I don't know how well known this is and I have meant to post this for a while now but there is a big Volvo breakers yard on the A1 at Wyboston in Bedfordshire called Lakes Autos, Lots of Volvos on site. Might be of use for a PRV engine or PRV parts, link below and sorry if this is old news.
http://www.lakes4volvo.co.uk/index.html