If you mean Working Tax Credits, then no, as you're not working; you're training.
If you're talking about VAT, then maybe, if you set up as self-employed and later work as freelance - see threads passim as infinitum.
If you're talking about offsetting the training against your current employment, I've heard of it being done but I suspect that they were apochryphal tales. I know not of any mechansim to do that.
Cheers
Whirls