Fold away sink

[U.Toadifact]

OK, here's my very first question on this great forum. I'm sure the answer is a simple one but for the life of me, I cannot fathom how to remove the fold away sink in my Swift Autocruise Select 122.

I noticed that water was finding its way out of the washroom and it seems to be residual water from the sink when folded. I assume such run off should be dumped outside via a drain but I do not know how to gain access. Can anyone help please?

 

[Boaty]

Ignore above. Mistake .

 

[Boaty]

Update on Auto-Trail 2022 basin fitting.
Photos below. Underneath the basin front cover are three screws. Once removed, the cover lifts out over the basin lip. That's it .
The waste hopper is connected to the waste pipe and is otherwise supported each side by silicone. The folding basin is secured by 2 screws either side. Spindle is pre-fitted into brackets. Glass shelf needs removal to access side screws.
Looking behind the basin and near the brackets the silicone sealing ain't great mate!