If you manage your account online, just click on your name in the left bar, and then the ‘contact details’ tab. You can then select ‘update my contact details’ and remove the existing details with your new ones.
If you don’t manage your account online, please complete and sign the complete the Change of Details form and send it to:
FAO: Member Services Team
Ecology Building Society
Ellis House
7 Belton Road
Silsden, Keighley
BD20 0EE