How about putting it outside. I have a beautiful one here in my garden in Glasgow.

It needs ericaceous soil and it shouldn't get early sun on the buds.

Looks as though it could do with a bigger pot but don't do it while its flowering. You could support it for now by giving it a liquid feed or ericaceous fertilizer, and then when you put it in a new pot use ericaceous compost as Linda says. And yes it needs to be outside.

Thanks for your answers. It is outside as it's on my balcony. So could I repot now as it's stopped flowering. Thats an old picture?

If its pot bound you'll be able to lift it out all in one piece without disturbing the roots, so it would be OK to pot it on. If its badly pot bound with the roots going round and round it will help to very gently loosen some of them -you can use an old for or similar, but try not to damage them.

If there's lots of loose compost best wait until autumn.

Thanks for all your advice.

Would any of you have any further advice on what to grow successfully on a north -west facing Balcony by the sea in Edinburgh. Last year I mainly grew geraniums as some other things plants were not hardy enough. I love a balcony full of colour so any advice would be good.