"I do wonder whether the amount of watering needed this summer affected the flavour of the tomatoes (diluted it, if you will)."
That's a very good observation, Yorkie.
Our greenhouse toms (Sungold, Scotland Yellow, Shirley and G. Delight), haven't been a patch on the outdoor ones.
Because greenhouse toms get noticed less than outside ones in growbags (well, here they are), the watering regime is different, mainly becuase one notices the 'droopers' while strolling by, whereas in the GH, they suddenly yelp for water when you least expect them to!
Watering before picking does reduce the flavur in toms, (surprisingly, quite a lot), but this year has been so odd that anything could have happened up to now, when we have an absolute avalanche of toms everywhere, and we're getting fed up with them!
We water from toms in trays as well as above (yeah, I know the feeding roots don't 'do' this sort of thing), but when there's a whole garden to spray, one says 'oh heck', and does it anyway...
Never known a year like it!