T4 Barajas Madrid on the 15th December, can guest anyone into the lounge from 18:00 onwards.
LGW North on the 16th December, can guest 2 people into the lounge from 16:00 onwards.
LHR T3 on 4th Jan, can guest anyone in from 08:30 onwards.
T4 Barajas Madrid on 4th Jan, can guest anyone in from 14:00 onwards