This poster remind me when I sometimes go back home late at night and I see the lampost's lights on the ground.

This poster reminds me of the old american movie of aliens, and I like so much his originality.

When I see this poster, I imagine that the UFO is like the sun that iluminates London. Something important in London is the underground, so it is noted in this poster. The light that falls in the city represents the symbol of underground.

My last comment has a spelling mistake in it - how do I change it please?

Watchful eye, warm like the sun Serving the city Reading all corners, the bridge

I like the mixture of fear - the looming presence in the sky - which changes to warmth and light when you read the commitment to service. It shows London to the very edges of the sea, making London Transport feel even bigger than the city.