Just an update, in case you've also recently joined Tesco's baby club. They had an offer on for a free Pampers Hamper. I think the voucher was given to me by the midwife as part of the Emma's Diary pack.
Tesco have now stopped this, claiming that Pampers don't have the hampers anymore. However, it's 2 months since I joined the club and I've only just heard.
Instead, they're offering a book of vouchers, which are £1 or £2 off here and there for different pampers packs.
This is really disappointing as you were supposed to receive money off vouchers as a member of the Tesco baby club anyway so the lack of a free hamper is rubbish. It was supposed to have some nice little bits in for mum too and, let's face it, everyone likes a freebee. That's why I joined 
Just sharing this with you so you don't end up disappointed too.
For info, the Sainsbury baby club seems okay and their huggies babypack was nice enough. Likewise, the Boots free changing bag and mat when you join their club is ok. Not brilliant, but good as a freebee.