For new parents joining the Tesco Mum & Baby club they're sending out vouchers for a Pampers kit free when you purchase Newborn size 1 or 2 nappies, as well as little Window Discs for your car so you can park in the Parent & Child spots. IMO it's nice that someone's finally doing something
to try and reduce the amount of nobheads that abuse the Parent & Child parking spaces provided by shops.
Also, Mothercare have just recently started a free to join Parent's club called Baby & Me
. IMO it's more beneficial to first time Mums or Mums who're having to go through and buy everything all over again... You can sign up in store and get handed a pack with loads of vouchers then and there, which you can use the day you sign up.
So if you were looking to buy something in particular for yourself / baby you may want to consider signing up as you shop or ask the sales assistant what vouchers are in the pack to get the best deal possible.