Odd Bathroom Tap connection, help?

That is a pretty standard monoblock tap fixing. There is a crescent shaped metal plate with a hole in it, and a similar shape rubber washer behind it. The post you can see on the right of your photo is what tightens the plate against the underside of the tap - sandwiching the basin between the tape base and the washer.

Yours looks like you might be able to undo it with a screwdriver. However the normal way is with a set of box spanners deigned for this purpose:

The water connections pass through slim annealed copper tails with threaded ends sealed with an O ring. They just screw into the base with a bit of PTFE tape on them for good measure.

Thanks for the advice, I shall give it a go and at least I know what I am looking for on the internet now should I get stuck. It does indeed have a screwdriver end on it, just need to find one that I can fit in there and see what happens.

Thanks, Alex

This might give you some ideas:

You may find that the screw slot is just for tightening the threaded stud into the tap, and then there is a hex bodied long nut that rides up the screw to do the actual tightening. (the photo is not really clear enough to tell)

Thanks for all the advice chaps, I'll read the thing and give it a go, what a great forum community this is.

Thanks,

Alex

If you scrape away the thin layer of advertising that portals like diybanter glue on the top, there is a whole world lurking blow the surface:

All done! :-)

Thanks for the help, took a couple of hours due to fiddly bits and tight spaces. Also stuck in isolator valves. Couldn't find in the Wicks the flexi connectors with the right ends so used some more pipe out of the isolator valves and jobs a good'en!

Thanks all,

Alex