I've never liked anything I've tried from this brewery, which I think is based in Bedford. Before the merger Young's used to be a London brewer, it closed down the famous Ram Brewery in London a few years ago.
Brews a lot of foreign lagers under licence, most of which are stocked by JD Wetherspoons
Beers:
Bombardier
Youngs Bitter
Waggledance
Brews under licence:
Red Stripe (brand actually owned by Diageo)
Corona
Modelo
Kirin Ichiban