Today was the start of the winter strip down.
To get the fuel sender fitted appears quite simple although of course it means the tank has to come out.
Firstly the tank was drained and removed from the car. This had the extra bonus of revealing the wiring harness that contains the extra loom wire (that I can use as a sender signal)
I located and de-loomed the spare wire in readiness for rewiring. I think the tank can do with a bit of clean too.