The Government have made no such proposal.
The UK last used its veto alone in the UN Security Council on 29 September 1972. The UK last used its veto with one or more members of the UNSC on 23 December 1989.
The UK has used its veto in the UN Security Council 30 times. It has used its veto alone five times. On the remaining 25 occasions, it used its veto at the same time as other members of the P5.