The one on the basin look like they need a demounting tool. What Brand is it please. And the supply is these fittings which looks like it's demountable but what brand is it please?
The top one looks like the old Hepworth push fit slimmer stuff that isn't demountable.
The brass nut which is part of the tap fitting definitely looks same as Hepworth. Don't remember ever seeing the "HL" on the fittings though.
A junior hacksaw carefully used through the gripper will cut the fitting off