50° 50.992' N 1° 10.580' W This is the entrance to one of the marinas. Note that the edge of the car park is underwater.
50° 50.920' N 1° 10.757' W The twigs here show how hide the tide reached on the previous day
No, these aren't underwater lights, but rather reflections of the main subway lights. The subway itself is off the top-right corner of the previous photo, where the person in the red jacket is going. This is genuine flooding by the way - if you look on Google Earth you'll spot a stream running parallel to this subway, which goes underneath the edge of the road in the photo above and drains more-or-less underneath the red lifebelt box.
50° 50.861' N 1° 10.734' W And now you get an idea of just how high "high" is. Underneath the water is a road that is normally easily above sea level, with a slipway off to the left somewhere underneath the reflection of Trafalgar Yacht Services. While taking these photos a local couple appeared and showed me a couple of photos from the previous day (remember, the highest astronomical tide of the year was actually on the 3rd). In those, the water was up to the edge of the shopfront.
They also had a photo to match this one. While in mine the carpark is still there, in theirs it was entirely underwater! Just the concrete edging at the top of the photo was visible above the surface.
Here's another photo of the same area, taken from the other side: