Clair - you need to be led by the lender here as to what needs to be removed etc in order to allow them to lend.
There are 2 restrictions on the title and together they indicate a trust/tenancy in common exists.
It;s unclear rom what you have shared as to whether that trust/TIC has come to an end and your Mother is now the sole legal and beneficial owner. That's going to be the key Q to consider when cancelling one or both of the restrictions.
You can submit anything you want to be added to the application and use the contact form to do so or post them as well
We can't tell you what to do and that's very much something you have to decide for yourself and I would always recommend getting legal advice and would assume that you have a conveyancer involved in some way if Mum is looking to mortgage the property - the lender would normally insist on one being involved.
I have recommended you hold fire though until your paperwork is received, it has been expedited and then contact established with the casework team
Expedition generally means it will be considered within 10 working days so a case of waiting for contact
If you prefer to do something else and submit more then post or the
contact form option remains