Hello,
I'm trying to figure out the wiring going to the light switches in my
hall and on my landing respectively.

When I bought the house, each switch fitted is a simple on-off switch
- so you cannot switch the hall light off from the landing or
vice-versa. However, I think the actual wiring inside the switch
housings may be designed for double switches - enabling one to switch
the hall light off from the landing or vice-versa. (At least, that is
what I'm hoping.)

Can someone tell me how to determine (visually or otherwise) if the
wires inside the switch housings are indeed as I am hoping?

I am only a DIY-er - not an electrician (as you surely surmised). I
have done various domestic wiring alterations though, in the past.

Thank you. PS - I do have a volt-meter at hand if equired.

Allen