If it’s ‘only’ leaking when you fill up (and engine off I assume?), then to me it would suggest it’s not related to the return side, so presumably something on the fill side. There is a vent pipe, but that would only vent air out. Maybe in the...

Do you want petrol or diesel? Most defenders are diesel. If you want petrol then better off looking for a series, which are even simpler, though you do need to find a decent example that's not rotted out or modded by numpty with no clue. Or both...

I agree that it sounds like the immobiliser is not allowing the car to start, for whatever reason. If you have tried the obvious (new battery in fob / spare key / all fuses etc), then my next ‘easy’ check would be the actual car battery. The F2...

My old banger £200 daily driver runaround bmw failed the mot today with a knackered subframe. I had a good look at it and the whole rear suspension looks like it's been parked in the sea for some years, so sadly off to the scrappy it goes. It...

New resevoir arrived yesterday 🙂

Did you buy a new reservoir? There is a small filter fitted in it - if it’s not been changed for a good time, it’s worth switching it for a new one when you change the fluid.

Flush it through well with the good stuff…