As I was just writing this thread…
…I thought I’d mention a mistake I made.
I’m putting a normal old fashioned voice line to the new office and originally I was going to use ‘proper’ phone line extension cable and run it around 75 ft.
Unfortunately, the new arrangement means it’ll be over that…but luckily, I have that 1000ft reel of CAT6…phew! I just tested a 3 ft length of the CAT6, just in case, and it worked (dial tone, rang someone to check quality, etc.). Of course a run of 150-200ft might be stretching it, but we’ll see.
If anyone has experience of maximum runs, I’d welcome the experience before a unreel a lot of cable! 
