MG
The Classic Marque

Is your temperature sender in the head or the radiator?

I’m thinking it’s the electronic ignition unit. Are these easy to replace without messing up the timing.
What is best make ?

I got some from Halfrauds.

I'm wondering if the electronic ignition has a heat related fault - hard to check. Do you have a spare distributor with points fitted? That would readily confirm if it was the electronic ignition (assuming the rotor arm is OK which sounds like it is). I've discounted the coil as you said you switched to a spare one

What radiator is it? I had a problem with blowing coolant out of a crossflow radiator due to system pressurisation resulting from a slight fire ring leak, I moved the expansion takeoff to the other side where air collects at the top of the downstream header tank and that sorted it until I cured the fire ring leak.

Terrorist attack? What kind if terrorist wanted to kill Anne Widicombe? I still think it must be a nutter.

Willy
Love the spark plug, great idea.
The H& H wiring must be correct as been on for years.
Ran the engine again this afternoon, not driving car though.
After about 30 minutes it spluttered and stopped. Engine temp about 160 degrees. Wouldn’t start again.
Tried fuel pump and all fine. Checked carb float chambers and full of fuel.
Fitted a HT lead to the coil and held the...

A few times recently my Sprite has pushed out coolant after running for only a few minutes. When it did it on Saturday I realised that the thermostat housing and top hose were cold and there gauge hadn't moved.

I didn't see any fluid loss yesterday and today the level in the filler is close to normal.

When it's properly warm and running the gauge gives normal readings. Even after...

It hasn't yet, it's this Sunday.

Do you have a local motor factor?

I have bought from ebay in the past.