The consultation on merging the Hammersmith Hospitals Trust with St Mary's, Paddington commenced on 1st May and runs until the end of July. The proposal, if agreed, would involve the two trusts joining up on 1st October. See here for further details.
The two trusts are also discussing amalgamating with Imperial College to form the first Academic Health Science Centre (ASHC) in the UK, which would be a foundation trust. It is planned that the ASHC would be in place sometime in 2009.