2 light switches into 1 ?

I have 2 single light switches I want to put into a double switch.

At present there is

- a one way one gang switch
- a two way one gang switch


I want in the double switch

the same


Please see the pictures for more details.
Im from the UK but this setup is in france so a bit confused and all the workmen are off til at least April 15.


thanks very much