I found another thread on this and posted but I didn't know how to make it come to the top?!
Anyway, we spotted the 3 for £5 deal but these now have 10% further reduction. Look carefully as some packs only have 2 blades but some have 3.
So 3 packs ( each with handle & 3 blades) came to £4.50.
Ipswich store :-)