Well I called the local service center today and explained my problem.
His response- You better bring it in, sounds like a card fault! :(
Not ready for that yet so I ducked out and picked up some white vinegar as per the manual to try de-calcifying it.
I have spent the last hour running a 50:50 mix through he machine switching between espresso/hotwater/steam modes and back to standby in between.
Initially it had same problem.
Going from espresso to standby the pump just keeps going draining the tank to the tray.
Go to steam mode and let it run for a bit and then back to standby and it stops OK.
After about 1/2hr of this it appeared to come good :)
Not convinced I kept cycling it for another half hour and flushed it with fresh cold water and it didnt miss a beat. :) :)
Im wondering if it was just too little use with me being away so much?
The proof wil be in the next week if it continues to behave itself.
From now on Im just going to have to ramp up the coffee consumption!!! :o