Brand new basin taps from Screwfix (Swish contemporary range,
conventional rotary operation, not cartridge-type).
One of them started dripping immediately after install. I fitted
flexible tap connectors, using a hack saw to saw off the old pipe. On
first use, the tap spewed out some copper filings..so that's probably
the cause.
Anyway, I decide to renew the washer. So I removed the tap shroud. But
I was then unable to turn the nut that holds the tap internals. I
used an adjustable wrench. I held the tap spout with my left hand and
tried with some force to turn the nut with my other hand, but it still
wouldn't budge.
This seems unusual for a brand new tap.
Any ideas?

Thanks
Bruce