I only use Tesco for petrol but I do have a clubcard. They occasionally send vouchers linked to what you've spent and you can convert these on line to CLUBCARD BOOST which makes them worth more. I then swap them for vouchers at various restaurants (prezzo and the line). Sorry I haven't explained this well but my understanding is that £2.50 converted to 'boost' is then worth £10.
Another silly little ABC game - shops we have loved and lost?
It had to come; Farage bringing ICE advisor to UK

