Even if there is a will, the executors have to apply to the court for a "grant of probate" before they can start executing the will.
http://www.direct.gov...eparation/DG_10029799
The executors can do this themselves or a solicitor will charge a fee to help them do it.
The probate fee is currently £90 plus £1 for each copy of the grant you want.
If this is the fee you mean, it is unavoidable (unless the estate is valued at less than £5k - see above). It is not a fee to an advisor but a Government-set fee by the Probate Service.
Some organisations that owe money, etc, to the estate, will insist on an indemnity fee being paid to them if the estate, even if small, doesn't go to porobate. Typically share registrars
If the will is simple and straightforward you should be able to deal with it yourselves, probate is not required under £5K, but if the will includes some insurance policies, stocks and shares or property and land, probate will probably be required and some organisations may demand grant of probate which has the effect of making the will a legal document.
There are costs involved if probate is required if you intend to use a solicitor, obtain prices from several.
Technically I suppose the solicitor is right in that the probate registry is part of the family division of the High Court. But a probate registry looks like any other civil service office, so don't feel intimidated.
The £150 fee referred is an OTT estimate - I told you exactly what the fee is above - £90. Its fixed.
I suppose it depends if you fancy doing the work / booking an appointment at the probate registry yourself - for the fee quoted the solicitor is going to spend between half and one day's work on this. These folk charge about £100 per hour for their time.