I'm not up on schools, but just offering a thought or two.
Much as we might love to believe otherwise - learning to fly (or many other similar skills) gets a lot harder and slower with age. It's nothing to be ashamed of - just how it is. That you doubtless know a huge amount about how aeroplanes work doesn't really change that because it's all about a strange combination of physical and mental skills that is fairly unique to the cockpit environment, and doesn't have a great deal to do with how much you know.
There are plenty of foreign schools out there and doubtless recommendations will come along shortly. Do be aware that experience gained abroad is only partially useable back in blighty - you can doubtless go and get your licence finished off somewhere with good weather (Florida is worth a look, there have always been a few European-approved schools there and I'm sure there still are), but you'll need to do some re-acclimatisation back in good old British weather (and RT, and airport conventions...) once you return. But, with 40 hours done here, and hopefully maintaining reasonable currency, that shouldn't be too much of a problem in your position.
G