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like to have a skeleton play list set out, so im not panicking trying to get the music playing!
If you search the forum for words like 'playlist' there are many threads with other Dj's giving a running order of the actual music that they would normally play at a Wedding. Whilst it is not indicitive of EVERY Wedding in the UK by taking some of each of the examples given on the threads will give you at least some idea (and confidence) in what to play on the night.
Probably the only aspect where you may get caught out would be the Bride and Grooms first dance. However if you have a reasonable music collection, then most likely the B & G will be requesting something very popular and you may already have it. The problems occur when they want an obscure track or something from an Album which was never a hit. Either way, there is nothing much you can do about this now, and so worrying about it will achieve nothing. If the B&G request a song on the night for their first dance which you haven't got, then you will need to resort to their 2nd and maybe even 3rd choice. This isn't ideal, but at least in your defence you can say that you have tried to make contact on several occasions to discuss this, but the information they gave was incorrect and the number was unanswered.
All, that I would be a bit apprehensive about, is whether the wedding is still going ahead!. I must admit that a few couples around here have had ther plans ruined by redundancy or the credit crunch, and so have cancelled their wedding or moved it to a date in the future. Most of them did bother to tell me.....eventually

but there was one occasion when I only found out 3 weeks before the event when I phoned them to check the running order!.
How long ago was this Wedding booked with you?. Have you spoken to them previously using the contact details given?