VRDP06100 | Adjustable beds [item 2(b)]: conditions to be met under item 2(b)
From HM Revenue & Customs · VAT Relief for Disabled People Manual
If the basic preconditions for zero-rating are met (see VRDP05000), then a supply can be zero-rated under item 2 (b) provided:
it is a bed;
it is electrically or mechanically adjustable; and
it is designed for invalids.