Neil, you can replace the CRB only with the engine in the car, to replace the clutch you will have to take the engine out. I have just done this on my 1.8K (non-VVC)
I would guess it will be just the friction plate but until you take it out you won't really know. There are 2 types of clutch for the K-Series, the standard and the uprated AP variety, do you know which one you have?
You will need 2 litres of gearbox oil as it is likely to pour out when you lift the engine and box out. You will have to drain out the coolant so it is good time to change it, you don't need to drain the engine oil.
You will need a decent torque wrench (for the clutch plate bolts) but apart from that a standard toolset will suffice.
Others things I replaced/did whilst I was at it;
Replace any hoses that are looking tired (I changed to completely silicone)
Replace clutch cable (is the VVC cable or hydraulic)
Engine and gearbox mounts
Alternator belt
Change to remote thermostat (I did QED but also PRRT option)
12th/13th is Le Mans weekend so unfortunately I will be there so can't offer any practical assistance.
I hired an engine crane for the weekend, cost about £30, if you can't find the loan of one.
Graham.
R7 GPK
Superlight #85