Where to get TRUS in UK?

Can anyone advise where I can get a Transrectal Ultrasound done in the UK.
I got my GP to refer me to a private urologist to check out my prostate. However the urologist said there was nothing wrong with it and would not do a TRUS for me even though I was willing to pay for it. The GP is not going to refer me either for a TRUS as of course the urologist does not think it necesary.

So, as I want a second opinion, does anyone know where you can pay to get a TRUS done here in the UK?