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Thanks Gareth... No, you're right, it certainly is interesting, and frustrating, and annoying, and stressful, etc. Lol I'm happy to change the CTS as I'm now not convinced it's the relay. Since changing the CSS it appears to start well from cold, but still demonstrates some starting Issues when hot/warm, but not quite as severe, and I'm not sure engine heat would affect the relay, unless of course the relay is overheating because of its fault... 😳 I've got plenty of time to think now, so I'll keep researching. 😊 Thanks, Paul.

Just thought I'd give it a quick go after it'd cooled a little; 1) fail but tried 2) fail 3) fail 4) fail 5) normal start, like it just decided to be normal... The above is a new pattern... After some thought & more research I don't think it's the coolant sensor, but I am leaning very much towards the fuel relay, as originally suggested by Gareth above...! From what I've read & learned, the fuel relay is triggard by the Camshaft Sensor, only after the engine starts cranking. Once the engine fires the Camshaft Sensor passes over control to the Crankshaft sensor. Now, I have a brand new OEM Crankshaft Sensor, so that is not (should not be) at fault. It's not the Crankshaft Sensor, otherwise I'd have problems after it started running, surely. This leaves the fuel relay; I say this because when running there are no issues whatsoever, no miss-fires, no stalls, power delivery is normal. The relay is what trigars the fuel pump to start pumping. Now, if the pump was faulty then surely I would have issues while running too, would I not...? This leaves the fuel relay (IMHO)... Any thoughts, anyone...? 😁 Thanks, Paul.