Average GPS coordinates for Thamesmead Postcode location: 51.495, 0.106. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Thamesmead on map:

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Listing cities & postcodes (2):
>> London, SE2 Thamesmead, England, GPS coordinates: 51.4869,0.1075
>> London, SE28 Thamesmead, England, GPS coordinates: 51.5023,0.1045