You’ll be fine. No road signs and no cameras.
This is how they are signed when they don’t want you to drive in the bus lane. They also have cameras monitoring to enforce the fines.
They are added to ensure only cars and buses can travel the road and trucks can’t.
This example is Cox Lane, Chessington which is also like Hounslow enforced by TfL.
And the other lane as seen from the other side.
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