Instant response from MrsB:
Somerset is much more sparsely populated that Kent. Things are farther apart and roads are slower. When her mother was in Chard the nearest proper hospital was 45 minutes away in Taunton and for anything really serious you had to get to Bristol. Chard was lovely, close to a nature reserve with cycling routes and an active U3A, but has no train station. If you're staying long term an accessible train station is probably advisable.
Suggest you check for U3A branches wherever you are looking. Great indicator of social activity.
Somerset has a mixture of very pretty posh places - which might be too expensive - and some quite run down small towns, eg Glastonbury - definitely avoid.
Wells, Crewkerne, Ilminster, Stoke sub Hamdon are lovely but some distance from the sea. The latter is close to Ham Hill a popular walking and beauty spot.
Axminster, just over the border in Devon, and Bridport, just over the border in Dorset, are lovely and close to the sea.
Sherborne, also in Dorset, might also be worth a look although it's further from the sea.
PS You might want to avoid the Somerset Levels because of flooding.