I can not remember. I will look in the loft this evening and update you.
Call me a stupid & I will not blame you. I made a mistake when I told you that the large tank in the loft did not have ballcock. I had a proper look just now and it does have a ballcock. I also found the cause of the water overflowing. The water keeps on dripping even when the ballcock is right up. I think that the washer or the valve must be faulty because the actual ball is okay.
So, can you advise me how to change the valve or washer so that the water is stopped dripping from the inlet feeder. I will have to shut off the water supply. How do I do this. Is this the mains water or can I shut the water from the valve next to the hot water tank.