Identifying my area code

Cropstar

Newbie
New to this. Recently bought a Zgemma H1. As part of the AutoBouquetsMaker it asks me for my 5 digit area code. How do I go about finding this? I've cycled through the towns on the list but there is nothing particularly local to me so it is difficult to tell which one I should be using.

I am getting BBC1/2/ITV1/Channel 4 but channel 5 says "Tune failed" so it's difficult to tell if I've picked the right area or not?
 
Tried 40980 but gave me nothing, including BBC1. Tried Bromley and got BBC1 again so maybe that's the area. If you get 1 channel then are you on the correct ID for your area?
 
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