Hi David,
Here's a slightly better picture of what I've done:
I've got the clutch master going to a t-junction, which then goes to a flexi hose to the slave cylinder and a brake pressure switch to replace the clutch switch I lost from the MX5 pedal box.
I'm not convinced there's going to be enough pressure to operate the switch, but it's worth a try!
It won't do any harm sitting there if it doesn't work, and the t-junction puts the flexi hose in a better position anyway
