They are not obliged to carry out the ceremonies though are they?
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Apparently they don't want to associate themselves with the piskies in Scotland - this may be a problem: one minister is minister of the richest church in the denomination, which is struggling financially. If his congregation are of the same opinion, the denomination may well cease to be an effective force, the stronger churches joining more 'traditional' diocese.
A bit like the CofS, which has lost eight ministers and seven whole congregations to the Free Church (and a further two to independent status) over the past five years.