This is where the whole of the back of the bed raises and all of the leg section raises together (not necessarily at the same time) so both people are in the same position.
If you have a chronic medical condition (i.e. ongoing that is not likely to get better in the near future) no. All the prices quoted are exclusive of VAT this is because if you are looking for one of these beds you probably have a qualifying condition (see list in "Your Health"…
A dual bed is where each side of the bed will have individual controls so one person can lay flat whist the other can sit up and watch T.V. for example.