Thanks for your enquiry.
You certainly don't legally need to instruct a Solicitor to do the necessary work, if the Executor(s)are happy to do it themselves.
You will need to let the 2 Banks have sight of the Probate and they will then prepare the necessary for the Executor(s) to sign to close the accounts.
As regards ***** ***** you will, however, need to involve a Solicitor if it is to be sold and likewise, a Solicitor should be instructed to prepare the necessary Land Registry Form transferring the Flat to you, if you wanted to keep it.
I hope this assists, and if so, please would you be kind enough to rate my answer. Please let me know if you require any further clarification.