As far as I know, there is no frost in the UK at the moment (?). Just put it outside. As long as you do not get frost for a few weeks, it will adjust fine. Plants are tougher than most make them out to be. Most problems occur becaue people do not give them wat they need, which includes a cool winter period.

This week is much warmer than last week with was below freezing all week lowest temp by me last week was -6 but it never crept much above 0 all week. This week much warmer and a lot wetter none stop rain