Post code prices!
Beware! Tempting as it may be to grab yourself a cosy little pad in a sweet little part of London town, supermarket prices vary depending on their locations! Sainsbury’s in Lewisham will shave quids off the same shop at Tescos in Surrey Quays, so even if you are lucky enough to live it up in a swanky area, consider making the voyage to a more lowly supermarket.
The best way would be to try at least once to travel to a nearby area and do your weekly shopping to see if the prices are different or not. However you should also consider the transportation. For example if you will need to pay £4 to go and come back then you may need to reconsider. In any case you will need to make the calculations to see what is the best option considering the distance as well as the prices.
Here is a useful google map with lots of London supermarkets to find the nearest branches and a massive list of supermarkets in London.
