Thanks Zufus, London 2000, and James C. All wise words.
As London 2000 says, I am entitled to a second opinion on the NHS, but that doesn't mean they will fund HIFU unless it's as part of a clinical trial. As far as I can ascertain I'm not eligible to join a trial because I've started on hormone therapy. Therefore, if I do eventually decide to go for HIFU it will be a very expensive alternative to the free NHS brachytherapy. I've been quoted approximate prices of £13 - £14K for HIFU in the UK, but I have yet to check out prices in other European countries. I suspect that it may be several years before HIFU becomes fully approved by NICE as a treatment option with the NHS, assuming that trials results support the findings to date.
I have a couple of months before my next flow tests, so plenty of time to trawl for information and talk with as many people as possible. Initially, I shall be comparing treatments without putting cost into the equation. Once I've made a choice, and if that choice is leaning towards HIFU, I shall than need to decide if the expenditure is justified!
Cheers,
JerryB-UK