Find a holiday home in Somerset where you will have a bedroom with a wide king-size or even wider superking bed. As increasing numbers of people opt for greater comfort at home, they expect at least the equivalent on holiday. Zip-lock beds are in common usage in may holiday cottages; these allow for two full-size single beds to be separate or zipped together. The choice is usually made at the point of booking although it should be possible to adjust this before arrival.
If none are shown, do please check the properties in Somerset. Sadly, holiday accommodation owners cannot alwys be relied upon the enter all details. One would certainly expect at least kingsize beds in luxury accommodation.