Kirk Mitchell, co-ordinator of the Save St Mark's Action Group, which has a 1,000-signature petition, said: "We are trying to preserve the building as a place of worship for the community. We are thoroughly opposed to any commercial vulturism. It's appalling that the finest church of its kind in the country is being sold to a businessman." But Mr Hammer, whose empire includes Urban Retreat at Harrods and who lives next door to the church, said many residents support his plans.