Cable adjustment is a constant thing, it's going to stretch out. You will either run out of adjustment or it will snap, whichever happens first, so replacement in-between those two eventualities is ideal.
A clutch replacement is an engine and transmission removal job.
this means:
definitely resurface the flywheel
possibly replace the pressure plate (curly finger fingers or platen for flat faced bearing)
definitely replace the throw out bearing
definitely replace the pilot/spigot bearing
definitely replace the clutch disc 190mm/7.5" Dia, 7/8"x 20 spline (4spd), Burton C752AF
definitely replace the transmission fluid (Redline MTL is great stuff)
definitely replace transmission front and rear oil seals
definitely lube the prop shaft
definitely replace the shifter saddle, if you have one
definitely replace the clutch cable (5 ft)FKC1020 Escort Mk1 1600 burton CCESCYB1
possibly replace the cable speedo with a GPS unit (plug the cable drive opening)
possibly replace engine and transmission mounts
The good news is after all this you should have a working clutch, if you don't over tighten the bell housing bolts (yes, that is a thing).
But before you go to all this trouble, just replace the clutch cable. It can stretch out unexpectedly and yes, snapping off at the top eyelet is a thing, especially with the later cheap reproductions (First Line).
good info here:
https://usa7s.net/ips/topic/14232-xflow-clutch-replacement/
https://www.caterhamlotus7.club/forums/topic/27661-clutch-release-bearing/#comment-493397
For how-to answers for your clutch job, a good start is Haynes Ford Escort MK1 1100 & 1300 1968- 74. That book should cover your clutch, transmission and most of your engine.
Plenty on Ebay. I've bought many books from UK on Ebay.
Another must have book is Tony Weale's 7 Restoration and Maintenance