Sorry for the late update but here it is.
I did finally manage to find a (one man) garage to solve the problem. He confirmed that the steering wheel was indeed from a later car, removed it and resolved a wiring issue left by the previous owner. Checked the codes, installed the new clutch switch I'd bought and all is now working. Very happy with the £45 charged. And I get to keep the nice wood rimmed steering wheel.
So, it seems that the 'cruise' light may not illuminate if the switch fails, as mine didn't and it's possible to install a later wheel and the cruise function will still work with the different switch layout.
Thanks very much to all of you who offered advice,
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