MapSearch is Inaccurate and does not Reflect Title Deeds

I am selling my house and my buyers solicitors have queried the fact that MapSearch view of the property differs to the Title Deeds. My solicitor is looking to charge e £250 for getting HM Land Registry to change MapSearch to accurately reflect the land boundaries to reflect the title deeds but I believe that this should be done by HM Land Registry free of charge as it is their error. Can anyone advise please?

Gary - MapSearch is simply a tool used to identify title information. It is not definitive re the registered extents for example and any mismatch would not be a barrier to completing an application to update the register itself.
If someone wishes to query the MapSearch extent and highlight a mismatch then they can do so by contacting us Public guidance: dealing with land and property - GOV.UK
We do not charge a fee. The fee your conveyancer is quoting is their own professional fee for doing the work so to speak.