In the edition before last of The Garden RHS magazine. May/ April There was a very good, colourful article on growing roses in pots. Maybe in reading part of your local library. I was going to have a go in one of my bigger pots. Then got hooked on Heucheras in pots, as they are perennials.Should be OK in Scotland. If you join GOY; Vicki, a winner at Chelsea, has a good blog on potting up Heucheras for an attractive display.