There are two BT telecoms cabinets (tall, green and physically secured) and three other cabinets here. The BT ones serve Woolston exchange. Virgin is a local fibre network, so others probably theirs.

Belmont Close and the surrounding area (from Whetstone and up Totteridge Lane to at least St Andrew's Church is Totteridge, not Woodside Park!

The postbox is on the kerb and there is a triangular grass patch with an old oak tree on it, where it currently shows grey - for precise dimensions, check an areal photo

I believe this is Weston Sailing Club - needs a check though. They have yacht/dinghy parks adjacent.

The postcode here starts GU8