Well that was annoying. Fitted a mixer tap to the kitchen, which came with two flexible tails.
Hot worked, nothing from the cold.
Swapped the cartridges, blew through the tap, all seemed good - but that cold refused to run.
Scratched head for some time.
Found out what it was in the end, it was the flexible hose tail on the cold feed - the threaded end that engages with the tap had a hole down it for the water but they hadn't drilled it all the way through so no way for the water to pass!
Grumble grumble
