Thanks for that very helpful suggestion, Mrs Bouquet. I've begun the job of cutting through all the upward growth just above the ground floor windows. Not finished yet, but I've made a good start, even if the line isn't perfectly straight. I can tidy that up as soon as it starts growing again. I'll let you know how it goes on.
If I knew how to reduce the size of a photo, I'd post one. But every time I try it says attachment is too large.
Heigh ho! Wneva