Hello Trog,
I too live in the UK. You can see my experience so far with PCa at the Yananow website - http://www.yananow.net/Experiences.html#hifu (HIFU / Jeremy Bacon).
I don't know whether colour doppler is available yet in the UK but you might consider a template guided biopsy, possibly preceded by a high quality MRI scan. A template guided biopsy involves taking multiple cores using a grid system to try and ensure that as much as possible of the prostate tissue is sampled. It won't give you a 100% guarantee that you have / don't have PCa, but it's way better better than the standard NHS TRUS biopsy.
I had a scan, template guided biopsy, and HIFU treatmant with Mark Emberton at UCH, London (http://www.prostatemapping.com/), but template guided biopsy facilities are available elsewhere in the UK.
If you would like to communicate directly you can get in touch via the Yananow website.
Cheers,
Jeremy