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3quid a blade down at tesco, the 21" are spot on aswell.. do the job. Theyre often out of 21" though, 20" work fine leave a tiny gap.. 22" seem a little big imo.
I've got the 22" tesco one's, after measuring the 22" there's only a 1cm difference from the 21" one's I had on before and about 4/5cm difference between the 20" and the 21". So 21" or 22" either will do and for £3 each there a bargain.