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Thanks all! My Dad said to poison it!! But I actually quite like it, and it does flower beautifully! It's just that it's reaching the roof now, and I don't want it to get much higher. I have been tempted to do it myself, but didn't want to stop it from flowering.
From what you have all said though, I get the impression that it would take a lot more than my "hacking" skills to do any long term damage!!
Thanks again all!
P.s. I might just make enquiries at the garden centre.