I'm not in the UK, but I hope you don't mind my comments.
As one who went through prostatectomy and actually came out (in the long run) not so bad in terms of ED and incontinence, if it were me I would not go through the surgery if it had no chance of curing me. I hated the recovery process. Loathed the catheter. The surgery is major, even when done robotically, and has risks, including dying on the table. Although the risk isn't that great for healthy men, it's still there. (There was a guy here, or on CancerForums.net, who coded during surgery and barely survived). The risk of real problems with urinary incontinence cannot be discounted, either. Incontinence can really wreak havoc on quality of life.
I don't think any potential benefit from debulking is worth the risk. Just my two cents.
Dx Feb 2006, PSA 9 @age 43
RRP Apr 2006 - Gleason 3+4, T2c, NX MX, pos margins
PSA 5/06 <0.1, 8/06 0.2, 12/06 0.6, 1/07 0.7.
Salvage radiation (IMRT) Jan-Mar 2007
PSA 9/2007 and thereafter <0.1pcabefore50.blogspot.com