Thanks Cass, I will try sitting in the sun a bit.But the more I think about it the more I realise it just doesn't have enough room anymore.
You can get the flexi ones off ebay, so I think I'll go & see what I can get. They have little balls on each end & you can cut them to size, but cos I dont know how big I'll get I think I'll just leave it whatever size it comes as.