Loose tap in 2004 Symbol

Kitchen tap has worked extremely loose, cannot access underneath to tighten, tried removing fridge vents to no avail, can’t think of any other way.
Surely I don’t have to remove the cooker to get to this!
Anyone out there had this problem??

I must be getting thicker in my old age.
I’ve just realised that the obvious way to get at the tap is to remove the sink unit. But what about the waste pipe?
This will have to be disconnected.
Has anyone experience of this??

Topaz sink drain is held in by a single screw between inside perforated drain top plate and the plastic elbow below, just unscrew, but lubricate sealing ring before replacing. SS sink is held in by 4 screws into the work surface.
frederic