Wow! Thanks for all the replies.
I was concerned about the invasiveness of Cotoneasters. I live in the city centre so if I go with that it shouldn't be too much of a problem.
I live on the ground floor so my neighbour's balcony is my roof. I do get quite a bit of sun on it. 3:00pm till sundown and the spot I've chosen for the plant is the sunniest spot. I forgot to mention there is a trellis there. Which I use as a wind-break so it's also quite sheltered.
The Sarcocca and Daphne look quite interesting I'll do a bit more looking up on them.
Sorry I know I keep asking questions (noobs
) but when are the planting times for these?
Thanks once again everyone