Serious answer is that its written into the BBCs remit, because the BBC is publicly funded, that it legally has to provide a certain amount of programming that it signed by an official British Sign Language expert.
Like you say, it is annoying (Especially due to the fact that nearly everything has subtitles available these days) So they fill their quota by repeating certain programs with a signer, but usually only in the middle of the night.
TL;DR ? They have to do it.
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