If you are one of the beneficiaries, the solicitor will write to you asking you to provide your bank details and documents to verify your identity and address. That is all, you do not have to sign any contract.
If there is no will, the beneficiaries can nominate someone they can trust in writing to act as executor of the estate.
With my husband's cousin estate who die intestate , the biggest beneficiary is the Inland Revenue, followed by the solicitor.