Journal of the Institute of Brewing, Volume 30, 1924, pages 321 - 322.
I don't think it was the conditioning or bottling methods which were hampering the UK's export trade. More that consumer tastes had moved on and UK brewers were serving up the wrong types of beer. For the most part, though some brewers like Allsopp did try to keep up, they didn't attempt to switch to Lager for the tropics.
Only problem with Lager was, it was too expensive: