These links may be helpful:
www.TheProbateDepartment.co.uk has lots of information and offers an economical probate service for simple or complex estates. There is also information on undertakers, registering a death etc etc.
www.DIYprobateUK.com help you do sort out the paperwork for a simple estate online, then emails the official forms to you fully completed to post off to the local Probate Registry with the appropriate fee.
www.PrepaidFuneralReview.co.uk offers independent advice on choosing a pre-paid funeral plan.