The WRTL delta is basically a WRTL 2600, but better. It features a aluminium canopy instead of the GRP one, and it can be mounted both post-top and side-entry, instead of the way that to mount a 2600 post-top, you need a post-top adapter.

Near brooklands museum in Weybridge

This WRTL delta is near brooklands museum in Weybridge. It likely runs on a SON lamp, and it is on a tall column, so it looks a bit small from the ground.