Hi I am looking for a Yorkshire Terrier for my wife for Christmas. If you can help please call me on 07788 695458 many thanks.

A reputable breeder is unlikely to let you have a puppy for Xmas. if you are willing to wait until just after, you may be able to find one.
Have a look for breeders here on Champdogs breeders index.
Make sure that breeders have carried out ALL relevant health checks on both parents.