Well, Robert, I'm quite glad to hear that!
Good to have the old prostate checked out; here in the states, they run a simple PSA test that provides a wealth of information quickly and painlessly - nothing approaching mammogram territory for male diagnotic tests
... if that is an accepted practice in the UK, the medical establishment there probably has an age related protocol for when they start administering the test.
That being said:
1. Stillman's is probably very diuretic due to its higher protein nature
2. All those pre-bedtime beverages have stimulants or artificial sweetners, again known diuretics.
So, Slim Shady was probably the "rightest" of all of us with the "diet soda" + excessive urination connection...
I'd try limiting those other beverages, and see if that helps... you can also cut back on the water a bit. There's no need to float, and the minimum doctors suggest here is 64oz. (okay, I don't know the metric equivalent of that!).
A reduction might be in order.
Lisa