In the UK, most bears were housed in concrete grottoes and pits until the 80s, at that time most zoos opted not to replace them when they died of old age rather than consider housing them in more naturalistic enclosures. Certainly the wonders of hotwire hadn't come of age back then.
Although two collections (Blair Drummond and London) have ceased keeping bears in the last couple of years, four more collections (Highland Wildlife Park, chester, South Lakes, and the RSCC) have started keeping bears (in the case of HWP and Chester - after a break of some years). In London's case, the result of their move is that Whispsnade now hold two, not one, bear species, after many many years of just holding brown bears.
Although Edinburgh stopped keeping bears after moving their last polar bear to Highland Wildlife Park, as everyone is aware on this forum Edinburgh almost immediately began redeveloping her old enclosure at the zoo to house Sun bears.
If Windsor Safari Park had not closed in the early 90s, this collection may have also continued to keep bears.