Magnolia Stellata might be a good choice. Always meant to get one and have never got round to it.

Never had a problem with a Camellia or Magnolia in a large pot. As long as you keep it well watered and fed (esp the Camellia with acidic soil and feed) it will be fine. I have a Magnolia Black Tulip in a large pot and it is happy. You may have to prune it to keep size in check but it does not grow that quickly.

Also make sure the pot is not in a windy area and doesn't get early morning sun in spring.

Many thanks to all who answered this question. Your comments have been most useful.

How about a Fuchsia too. They can get large in a season, bloom for many weeks on end, and could be discarded and another one used next time round. Sooner or later a shrub that wants to be really large will get pot bound, and you may be a bit older and less able to get it out of the pot......we have had this problem recently. We did it, but it was a massive effort than when we were younger, and never gave it a thought. When you choose a pot, go for one with sides that slope outwards too. For winter plant bulbs in the pot.