A simple heat graph based on UK Locations

Description

According to the web there are just over 600 'Life Peers' in the UK.
When someone becomes a Life Peer they choose a location to be associated with and they become 'Lord or Lady of location'. Usually and almost exclusively those locations are when the Peers are living at the time they are made a Peer.
The task here is to throw together a heat map showing those 600 or so locations on an overall map of the Uk. I'm not sure if there's a list somewhere you can strip straight in Excel...most likely somewhere on the web there is.
So it could be quite a quick and simple task if you can find that list and know how to put together a Heatmap (tableau?)