Hi Martin, thanks for that, I have looked at post about the HCV but I'm not sure where mine would be as some seem to think it's accesed through the bulkhead under the scuttle in front of the windscreen and others it's a resister type? Accesed via the drivers foot well, as I say it's a 2003 on a 52 plate, going to have to do some digging.
Many thanks Joe