I rang my local store today to see if they are doing the 3 for 2 on everything that they did last weekend, but was told it was only a trial and there will be other offers in the coming weeks. Nothing on today but she suggested that I ring back tomorrow morning as "there may be an offer on by then". As I was in town, I called in to see if I could find any more details and overheard 2 assistants say they think the offer on Sat and Sun only is £5 off £20 spend and £15 off £50 spend. Not sure about online though.
in misc as not confirmed yet
mse spot - thanks to shopndrop