Transfer equity cgt and ppr

Hi
I wondered whether someone could advise on best way forward for adding myself to husbands other property. The property was bought in 1999 for £60k now worth £140k we both lived there (unmarried at the time) for 2 years and then moved out and it has been let since. My husband is higher rate tax payer so we wanted to benefit from tax relief by putting flat into joint names. We are now married so no cgt but what impact would this have on selling in the future as I understand I won't have any ppr as I was not married when I was living there? If we put in joint names now can we change the % before selling so husband can still get ppr on a significant proportion of the gain.
Any advise much appreciated
Thanks