Hello Peasie and welcome to the community; although the Long Tailed Tit has lost most of its tail feathers they will eventually grow back later on in the year when they go into moult following breeding season and the bird should manage fine despite the shortness of tail feathers; there was a post recently with photo of another LTT which had length off the tail. HERE - 11th photo down.
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Regards, Hazel
(Pardon the Scottish Accent)
Cin J
2013 photos & vids here
eff37 on Flickr