Question to the Cabinet Office:

To ask the Minister for the Cabinet Office, how many votes cast (a) in person, (b) by proxy and (c) by postal vote were declared void due to the voter being judged to suffer from dementia in each of the last four general elections.

There are no grounds for rejecting a vote on the basis that the vote was cast by a voter who had dementia and therefore, the Government does not hold any data relevant to this question. It is not possible to determine whether a vote has been cast by a voter with dementia.