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Legal action would be their recourse and yes small claims if the case is subĀ£10K. It is a debt matter to the estate now.
Slightly analogously my own father died in May. I'd been estranged from him for 10 years mainy because of the woman who he'd started living with when my momm died in 1999. My brother and sister are his executors and they rang me shortly after his death for some 'advice' (I'm a Commercial lawyer). Apparently shortly before he died large sums of money had gone out of his account into a joint account with thi woman and straight out into her own account. They wanted to know what to do... I said call the police as they had a fiduciary duty to the benefiaciaries of the estate to recover the cash which was potentially criminal...it's ongoing!
Sorry, a follow up - what if the executors are stymied in chasing up, would that be a matter for small claims or another route?