Wills and estate admin can be contested on various grounds
1If a person doesn't provide for dependents, children incl adopted children ofall ages and a spouse (but not step children unless they have been treated asthe deceased's own childeren) in a will it can contested by making a claim under the THE INHERITANCE (PROVISIONFOR FAMILY AND DEPENDANTS) ACT 1975.
Details are here
2Undue influence if it is thought that the person making the will had been "gotat" when drafting the will.
3Or if, when drafting the will the person lacked mental capacity/didn't knowwhat he/she was doing
There are strict time limitsfor contesting will under 1 above of 6 months from death.
Claims under 2 or 3 above 12months.
Claims under 4, no time limit.
Promissory Estoppell. This is atechnical legal doctrine not used very often. It says that if anyone has beenpromised something during the lifetime of a person and they relied on that promise to theirdetriment then they are entitledto have whatever was promised. The classic case is indeed the young man on thefarm, who is told by the old man "don't go off to seek your fortune son, butstick with me and work on the farm and I will leave it to you when I die,".
So the young man doesn't go offto seek his fortune and stays and works on the farm and it turns out that whenthe old man dies he leaves everything in his estate to the prize cow, Daisy orhis new girlfriend, who is 30 years younger than he is. In that case, the youngman having given up a future (to his detriment) on the basis that one day (hewas promised) the farm would be his and he believed it and relied on it, he canget a court order that the farm is transferred to him. Such claims are notcheap or quick to bring in do require a large burden of proof of the promiseand reliance to detriment.
Anyone can get a copy of a will once it has beenadmitted to probate from HM probate registry, upon the payment of five pounds.Anyone can also hold up the granting of probate by entering a caveat at theprobate registry. At least, they will then find out if there is a will. Theentering of a caveat will certainly wake up any executors. Some explanatorydetails are here;http://www.anthonygold.co.uk/site/ang_articles/ang_articles_filing_a_caveat_first_step_in_contesting_a_will
Who administered the estate? Do you suspect the will is fraudulent?
The will was allegedly drawn up in 2003? Have you spoken to the neighbours who allegedly witnessed the will?