Came across this checker from Ofcom which provides you with the ability to check both the broadband speeds & mobile reception based on your postcode.
Note: The checker uses data provided by the UK’s major Internet Service Providers in June 2015 to calculate average speeds. Hence for my postcode the Broadband is wrong as we now have fibre hence I have deleted the word useful from my blog title as that could have been misleading ;-). It could be useful 🙂
The checker can be found here: