Marks & Spencer's prawn mayonnaise sandwich. Al Desko eats it, so you don't have to. 12 March 2012. Sign up for our expert view on everything that’s worth eating, drinking and queuing for in London.

A £6 smoked salmon and cream cheese offering as well as a £5.50 prawn and mayo sandwich were also launched, along with a £5.25 gluten free sandwich and a £6 avocado and 'Rainbow Veg' offering.

This time last year Marks and Spencer launched its best ever lunchtime meal deal. For £3.50, their three-part bundle included one of their famous M&S sandwiches, including classics such as ...