this is from some church organist website:
The following rates are fairly typical:
For playing the organ, rehearsing and directing a choir - £120.
The important word here is "rehearsing". If a choir is present, but the organist doesn't have any extra work to do because of this, or run a special rehearsal before the service, the fee should be the same as for just playing.
For only playing in a major church - £100.
For only playing in a small church - £60.
Occasionally, some attempt is made to distinguish between "professional" and "amateur" organists. But these terms are not well defined and generally ignored. This matter is further complicated as many church councils set the organist's fees without reference to the organist, or his or her professional status, and the organist is happy to accept this.
It is also important that both you and your organist have some understanding and agreement about how long the ceremony is likely to last. Many organists are happy to allot 90 minutes (some only 60 minutes) to your service, and they may well then take other bookings which depend upon them leaving promptly. If the start of the wedding service is delayed by over an hour, and the organist then leaves after the first hymn, some dissatisfaction may be felt. It could be VERY useful to have discussed such things early in negotiations - and possibly make arrangements for overtime payments.
If the church has an appointed organist who plays for most services, it is usual for him or her to play for weddings. If granted permission, you should be able to bring your own organist, but then BOTH organists may expect a fee. This may not seem fair, but many organist/church contracts include such arrangements.
Many wedding ceremonies are videoed, and can lead to further expense as (pursuant to the Copyright, Designs and Patents Act 1988) the organist's fee should be increased (often doubled). Once again, this is not universally applied - but the possibility needs to be taken into account during planning.
If you choose to have a choir present, a fee