thanks to everyone who offered some comments/opinions. Have tried everything and more which has been mentioned. There was even a slight tear in one of the washers in the piston so even replayed them. Nothing works so I've done the unthinkable and booked it into my local dealer next week. With departure only 2 weeks away time is not on my side. I'll let everyone know what the issue is. I'm still of the opinion is ABS related however. Time will tell.
cheers for the comments
cheers for the comments