Yes that’s correct, but judging from the smell, I think that there is a little more than just water under that floor! It’s probably a compound issue!
When I was placing the filter I did notice that under the sink there is a trap compartment, and the smell did appear to be originating from their.
I suspect that their may well have been a family of mice living underneath the toilet floor; but then The Floods came, some of them made it, some sadly may have passed away.
Also looking at the floor it appears to be laminate possibly glued on top of marine ply, so at some stage sooner rather than later, we are going to have to ‘bite the bullet’ and bite it hard, cause that floor may need to come up, cleaned, and then relayed.
Now, this is where we really do need to form a toilet-crew… and a plan and timetable… Help!!
Almost Certainly!! 
I remember when Pete build the toilet cubicle, the floor is linoleum and it should not be glued down, but only “trapped” under the edging batons.
We decided not to glue it exactly for maintenance reasons.
Mind you, that was 10 years ago, so it may be that the linoleum got glued down at some point between then and now, but i can not remember any instances when that floor was lifted since construction.
Well, we will probably need ‘Gas Masks’ then!!
I have got a box of disposable gloves and face masks that I have allocated for the work, but I must remember to bring my knee pads!
Who knows what we’ll find underneath there??
It’s gonna be fun! It’s gonna be The Project of 2026!
Fixing the Most Important Piece of Equipment in The South London MakerSpace!
The (humble) Toilet 
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You’ll deserve to be SHOWERED with praise if you do. .. maybe after a shower.
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Showered with praise, The Toilet, Boy this is too much… lets not talk about long tunnels…https://www.youtube.com/watch?v=zU0-omTR1Ps
Hopefully, it’ll only take 31 seconds to fit the filter… 
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Ahhhhh I’m so glad I caught that reference!
Also best of luck. If your nose starts to bleed we have soldering irons available.
There’s e-nuff kit lying around to take The Toilet into the 21st and beyond.
Motion-sensing leds are a must and maybe a tune or too, chosen by a Quantum Super-Intelligence, together with holographic images of please was your hands…
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