No cold water from tank after running empty

[DJM]

We had a new mains water feed from the road installed yesterday and it all seemed fine, but an airlock stopped the mains to the loft storage tank and it ran dry. I cleared the airlock and tank is filling correctly.

However, Hot feed works fine with water flowing freely, but we have no cold feed at all. I have tried the hose trick to see if it is an air lock, but this time no luck

Any ideas?

 

[DJM]

Managed to clear the air lock with the hose technique from a different tap.

Thanks for looking anyway