Just saw a deal in a local Tesco store. Searched online, same deal found on one of the website as well. address belowhttps://www.tescomobile-freesim.co.uk/Default.aspx
So its online as well as in store deal.
Tesco mobile SIM card is offering Free SIM Card with triple credit on top up of £15 and £20 so if you top up for
- £15 you will get £30 free = £45
- £20 you will get £40 free = £60
I am personally on contract, but for someone PAYG, looks like a nice deal.