It usually grows into quite a good size! but this has been very neglected? I am sure with care it will recover. If it were mine I would give it a bigger pot of well drained ericaceous compost and water well this summer, it also needs some serious pruning and a good feed? But I would only prune by one third to start with and when it looks happier, prune as you need to to improve its shape and thickness. Some say they dont mind full sun but I find mine like a little shade in the hottest months so I move them. It may be that other members would suggest a more drastic first pruning?

Thank you.
I know it was in amongst a lot of pots, trees and shrubs where it came from so whilst not intentionally neglected I am certain it would have been over looked.
I have been worried about pruning it as I would hate to kill it off.
I just know it looks completely different to any others i've seen on here LOL

Whilst I can't recomend more drastic pruning, D, that is what is going to happen to one of ours very soon. It has been allowed togrow much too large and will be cut back to quite short stems. Will this kill it - I don't know but that area of garden will be much more open regardles.

When would be the best time to prune and would I just take a third from the top ?

Wait until it has finished flowering and then cut back. If taking a third off is all you need to do then great - if you need to take more do so. Two very knowledgeable gardeners told us it would be okay to take back down to a foot and, as Bulba says, we are going to drastically reduce - it is eitehr that or it departs the garden.

Thank you, I shall re pot it, be patient then start cutting it back.

There are some nice new shoots at the base. You could cut off all the branches as Moongrower says, and leave these new shoots to produce a 'new' shrub. Or if that seems a little drastic cut back to a branch higher up and then reduce further in future years if necessary.

Thank you Volunteer.
It's a bit like going from really long hair to short so I think i'll try a bit at a time LOL

Good luck!

Thank you :O)