To transfer the properties to a Ltd Co will mean obtaining a current market value for them and then any gain is potentially taxable, plus there will be stamp duty, as effectively the properties will be sold to the company.
The above is unlikely to be cost effective.
There is another way to make use of a limited company though: set one up and use it to manage and maintain the properties. Thus all rents would be paid to the company, it would charge you the maximum of the going rate for management (so as to reduce your personal tax liability).
There are myriad ways to withdraw money out of a limited company either without incurring a tax liability, or with any liability significantly reduced. For example, if you enjoy eating out, you might have a directors board meeting at your favourite restaurant on a regular basis in which you would be reviewing the position of the company, each meeting being minuted. Again, the company could instruct it's directors to attend a London property show to assist in deciding future strategy of the company. Thus the hotel, meals and travel would be met by the company. While in London, you might then decide to take in a show or two, or enjoy the night life in other ways.
Limited companies are a godsend, trouble is many small companies don''t manipulate the system to maximise the privileged position directors enjoy.
David
Long ago, below an picture of a 4-masted sailing ship in a heavy storm was added: "A ship in a harbour is safe, but that's not what a ship is designed for"