Intermitant non starter

Car starts sometimes and drives fine with all gears selecting ok, then wont start, fords have had it on computer and they gave a print out saying "clutch position sensor fault,reqs new tranmission control module and gear shift actuators. Clutch is also at maximum wear figure, strongly recomend clutch and slave cylinder changed also" they quoted a price of £2000 plus, i think this is abit harsh as the car drives fine when it does start so can't need all these parts replacing, is the clutch on a durashift the same as a normal manual clutch (regarding fitting) any info on this would help, Thanks