I work in Hammersmith and went for a run at lunch along the river, ran past the brewery, didn't realise I was so close! I'd like to the visit the brewery one day, but they do no tours after working hours, could take an extended lunch break...
I think this will be fine, breweries often get bought out because a larger company wants to add "craft beer" to its portfolio, and buys the brewery because it's doing well. To close it or skimp on ingedients would defeat the point of a multi-million £ buyout.
I can't think of a brewery buyout which has resulted in a decrease in quality. Maybe a lot of them are still early days, but more good breweries will come as others go. Ironically, the brewery I think has decreased in quality are those indie punks Brewdog, their core range just doesn't taste like it used to.