XE Aircon blowing warm drivers side, fine passenger side

Hi all,

Ive had my XE around a year now and i love it, had it regassed twice in 18 months which seems odd as my ford fiesta didnt need regassing  in the 5 years i had it previously. But  i noticed in the last few dfays my ac is only blowing cold out of the passenger side, the driver side is blowing warm air are both the rear vents.

Ive been looking across the forums and can see people have had a few different issues possibly point to the condenser. Just wondering if anyone has had an encounter like this or know of a good specialist in the Kent area.  

Any idea on price of fix and stuff from people who have had this issue too would be aweosme! 

Thanks in advance!