where is best place to have a pepper plant

I notice you are in Lancashire, so unless the really exceptional summer continues, the peppers are unlikely to do well outside, even in sheltered spot. Even here in France we get a much reduced crop of small peppers compared with the ones grown in a polytunnel which are as good as ones from the shops. Peppers will do far better if given a free root run though, and lots of humus and water, so if you have the space why not plant it out but make a little frame over which you could put a polythene 'cloche'. (with three to four feet of headroom) That would be ideal, as peppers really need high temperatures to do well.