I have put new hose and valve on that sits under inlet manifold.

The plugs have not been gapped by me, i bought plugs from halfords.

What is correct gap for plugs.

As for icv, when i took it off and cleaned it, i found that if i fill up one of the chambers with carb cleaner, it leaks through to other chamber, (is it knackered)

theres no point cleaning icv valves as they never last anyway cant say if its knackered but thats youre last option if that doesnt cure the issue then it will be a trip to ford for diagnostics correct plug gap is 1mm most halfords are gapped at the old 1.3mm

Thank you, I will re gap plugs, and try new icv.

failing that back to fords

Plugs are now at 1mm

New ICV valve

New coil

I found out in process of putting new coil and doing leads, that all spark plug leads where reversed, , i.e

number 4 plug lead was in number 1 on coil, and 3 was in 2 on coil and so on. i dont know how long they have been like that, but they are now the right way round.

Car drives superb, but just does not like brake lights being on.

oops, I misread the 19v lol. That is too high, still think theres something awry with the smart charge (presuming you have it). I wonder if their is some sort of short circuit when you apply the brakes, perhaps its shorting out and causing a spike in the juice required. in which case, I would be very glad that you are well earthed!

Have you tried applying a multimeter to the body work around the light clusters, just to make sure theres no increase in voltage through the bodywork when you apply the switch?

if the plugs were the wrong way round you would have needed the new coil anyway as its likely damaged the original as i said the plugs come pregapped at 1.3mm but ford made it 1.0mm due to interference from the spark or summat like that i personally dont think theres an issue with the dip my old mk1 did it and it was the emissions trying to find the lowest possible setting

Check the brake light switch for shorts or damage.

I did think of the switch, but discounted it, as there are 2 wires, one live and one only live when pedal is pressed. So thought if switch was knackered, then lights would not work, so either switch works or it does not, i could not see how this switch would cause this.

But, I will check it out.

Failing that, am going to get a relay, and some wire, and put brake lights on new cable connected to relay, direct to battery via brake pedal switch.

Also why does my car have switch on clutch pedal, i thought that was only for cars that auto stop and start.

artscot79 I had new coil fitted 3 weeks ago, and 4 days ago, my car suddenly started losing power, like it was running on fumes, and putting my foot down was impossable, so i put my old coil back on and it was perfect, so these leads being on wrong way caused new coil to die, since i have found out leads where on wrong order, i have now got another new coil.

Would these leads being on wrong cause high fuel usage, as my car drinks fuel like there is no tomorrow

it wont be helping as the firing order is all to shot mate so yes it would drink more fuel