Hi. My name is*****'m looking at your question now and will post my answer or ask for more information here in a short while.
Transfers of assets between spouses who are living together are treated as having been carried out on a "no gain, no loss basis" so there will be no CGT implications.
As no cash will change hands and there is no mortgage on the property (a mortgage counts as cash) there will be no stamp duty to pay.
Complete and submit a form 17 to HMRC when the transfer has occurred.
I hope this helps but let me know if you have any further questions.
You already own it between you so I cannot see how the 3% surcharge could apply. Your wife won't have increased the number of properties she owns, just her share.