When I was a lowly assistant catering manager at a certain venue in North Wales, many moons ago, I took and managed a booking from start to finish for 200 pax.
Between the wedding lunch, the evening buffet and disco, free bar for 2 hours, flowers arrangements, carriages (taxis really), entertainment licence, and all sorts of other pre-booked extras it came to the total of 12 k.
All the other stuff, as in cars, wedding in the church, cake, photographer, and all ancillaries were not included and I cannot say what they cost as I don't know.
But here is a modest breakdown from googled link.
The Cost
The average UK wedding in 2002 was costed out by weddingguideuk.com as follows:
Bride's wedding ring £200
Groom's wedding ring £150
Wedding dress £700
Headdress and veil £150
Bridal bouquet £75
Shoes and accessories £125
Bride's beauty treatments £75
Bridesmaids' dresses £500
Groom's outfit £150
Flowers (buttonholes, church, etc.) £200
Printing £300
Wedding cars £300 ()
Civil/church fees £200
Photographs £400
Video £400
Wedding cake £200
Reception venue or marquee £600
Reception decorations £150
Wedding reception £2000 ()
Evening reception £750 ()
Drinks £750
Entertainment £500
Bride's going-away outfit £150
Wedding night venue £125
Honeymoon £1500
Wedding insurance £50
Other expenses £300
Total £11,000
http://www.howtobooks.co.uk/family/weddings/costs.asp
I got married in Phil, and the hotel wedding package for us, was less than 500 quid.
BTW, we invited little over 90 people, nearly 200 turned up....