The OFCOM coverage checker is very good. If you put in a postcode it will show you what coverage there is by network. The really useful bit is to follow the link to the coverage map. That allows you to zoom in and out, and there's a drop down box where you can choose which provider.
Here's a link to Inverness Town Hall that I put in as an example:
EDIT: Link just goes to the " Input Postcode page " 🤔
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