I am not sure what the ’85 County switch looks like but if it is similar to the Defender TDi’s and TD5’s and is located on the steering column then you should be able to remove the electrical contact pack at the back of the switch while leaving the rest in place. It will probably be held into the switch assembly with two small Philips head screws on opposite sides, about 1 – 1.5cm from the rear of the switch. It should then slide off the key barrel actuating rod which has a profile that goes into the contact rotor. 
  Once out, you should be able to bend back the metal tabs to get to the innards (don’t loose the little spring and locating ball). It is a bit fiddly getting it back together but it is possible as I have just done mine (TD5). Replacement contact packs are available for some switches and are pretty cheap Land Rover Diesel  Steering Lock Ignition Switch Base PRC2735 .
  I know that later model ignition switches are held onto the steering column with shear head bolts which have to be drilled and removed with easy-outs however if it is just held on with normal bolts then you may as well remove the whole unit as it would be easier to access the back.
  
Good luck with it.
				
			 
			
		 
			
				
			
			
				Martin
The secret to happiness is to truly want what you already have
Oil leak?...Nah, sophisticated anti corrosion system!
 
'04 D2a TD5 Manual "Snowy" - Daily 
'04 Def 90 TD5 "Hue" - New toy
'03 Def 90 TD5 - Son's toy
'16.5 D4 TDV6 - Gone
  
			
			
		 
	
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