If you want to know for your own premises easy enough to see what the BT Wholesale checker says.
if you want a general area map for Exmouth, is that because you are thinking of moving to one?
Kindness isn't going to cure the world of all its awfulness but it's a good place to begin. Daisy Ridley.
My broadband basic info/help site - www.robertos.me.uk.
Domains, site and mail hosting - Tsohost
Connection - AAISP Home::1 80/20. Sync 54999/14466Kbps @ 600m. BQMs - IPv4