Hello, cleggers.
(1) As no money is changing hands there is no Stamp Duty to pay. There is a box on TR1 and the Revenue form for your solicitor to make a very simple declaration.
(2)There is no other tax of any sort to pay beyond VAT on your solicitors account.
(3) The only Govt fee to pay is the LR fee, which on the figures you gave me is �40
(4) There is no necessity or requirement that your wife employs a solicitor. If you are using the Nationwide solicitor instruct that the forms be sent to her with a pencil cross indicating where signatures are required. A paragraph in the enclosing letter can say "we recommend that you obtain legal advice before signing" but action upon that is optional and can be ignored. Remember that your wifes signature must be witnessed by someone other than yourself, and that the witness is evidence that it was freely given and not under duress. Your wife can employ a solicitor to witness her signature, around here the charge is �5.
(5) However, if you yourself have employed a solicitor other than Nationwide, it is up to you whether you follow the advice that you are paying for
(6) The term "transfer of equity" is a completely wrong description of what you are both doing. The mortgage is a liability, and removing your wife from it beneficially relieves her of debt. A joint tenancy is basically a gamble on survivorship, nothing more, and not wishing to gamble further is just that, nothing more. Neither is a "transfer of equity".