Afraid it does look rather like gall mite but not (yet) a serious attack. To be on the safe side you should remove all the affected shoots and burn them. When I did this it didn't recur -so far so good!.

Oh dear! I'll do as you say - thanks again for your advice.

I think it's capsid bugs. Mine get like that but if you wait for new growth it will be fine.

http://www.sciencephoto.com/media/14989/view

Gosh Hywel do you really? That's brilliant news. How can you be sure - can you find the bugs under the leaves?

I never see them but they leave their mark. It happens every year to a few fuchsias but this year has been bad. The bugs usually come early in the year but the deformed leaves last the whole season so I usually cut them off.

The bugs in cuckoo spit can cause this distortion also.

So how do you tell capsid and gall mite damage apart?

I've never seen gall mite but I get capsid bug damage every year.

Capsid bug damage :-

http://www.sciencephoto.com/image/14989/530wm/B2600094-Capsid_bug_damage-SPL.jpg

Gall mite damage :-

https://maxpull-tlu7l6lqiu.stackpathdns.com/wp-content/uploads/2015/11/Fuchsia_gall_mite_456.jpg