Having had a power steering pump belt fail on me, it made the vehicle (110) almost undrive-able the steering was so heavy without assistance.
A friend had a very early classic which did not have PS fitted, it was in mint condition and he sold it to a collector (in Japan) for a fortune. Every prospective buyer from UK whinged about it not having PS but, as he got fed up of pointing out, if he fitted PS it would no longer be original