Well, Ed, once the executor has grant of probate (which itself involves his paying any inheritance tax before he can get a grant.He normally takes a 'probate loan' a kind of bridging loan to do this then repays that from the estate) he can proceed to administer the estate.That's when the fun starts.If the estate is very simple e.g. , consisting of the deceased's savings in the bank, his ordinary house with ordinary contents and some shares on the stock exchange the only delay is in waiting for the Revenue to agree the executor's valuation made as at death (which was done when probate was obtained).If not the executor can spend the next two years arguing about businesses privately owned (trading or not trading, assets wholly for business purposes or not,value of share in it, tax relief claimable ),all expenditure in the seven years before death (was it out of income or assets, was it for maintenance of the deceased or others, was it gifts of an extraordinary kind to reducing the estate) land owned (was it agricultural or business or partly so or just private ) and so on. The Revenue can be quite slow.My mother died just 3 years ago, leaving an estate of extraordinary complexity and value and we haven't agreed absolutely everything yet (but we're very close) !
However, straightforward bequests of modest amounts of money or identified chattels can be dealt with almost straight away on getting probate and should be. The executor is not barred from distributing the whole estate, including residue, then but he'd be very unwise to do so until everything had been finally settled with the Revenue !