You can try ringing them firdt thing in the morning for an appointment and take it from there. The only way is to go to the office.
London IPS Customer Service Centre,
89 Eccleston Square,
London,
SW1V 1PN
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Monday to Friday 7.45am - 9.00pm. Saturday 9.15 - 3.35pm. 0300 222 0000 (Adviceline)
The London office is situated on Eccleston Square/Belgravia Road. Most customers approach the building via Victoria Staion. Access to Globe House via Victoria Station comes via Hudson Place which is adjacent to Platform 1. This will take you onto Bridge Place. The London IPS Customer Service Centre can be seen on the right hand side, at the top of the road near the traffic lights.