Originally these two were covered by some Ivy, once that was removed the true extent of the dodgy wiring was exposed

I rewired one of these- IQ Single Pyro Pro Symmetric PIR Sensor Floodlight Graphite 120W from Screwfix. I think it was about £25 and is brilliant, much better quality than most PIR floodlights!
The light also has a spare normally open terminal, which is energised when the PIR is activated so you can wire a plain flood light up to it and both lights will illuminate at the same time
