The heated mirrors should be on all the time, the is true of every MG/Rover/Austin/Range Rover I have ever had where electric mirrors have been fitted.
However for some reason on the ZS and ZR (and the 25/45 I expect) they have a habit of failing, on my ZS the O/S works, on my wifes ZR only the N/S works.
In both cases changing the glass didn't make a difference, one day I will get around to finding why.
They definatly are not dependant on any other factor than the ignition being on.
(disclaimer - I have no experience of the mk2 models.)
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Former custodian of the legend that was FE54 - RIP
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