Defintely no good, i'm afraid, and I speak from experience! We too have an Edinburgh Georgian flat, skimmed before we moved in 4 years ago. within a year it had cracked. We're on a main road, slightly set back, and the heavy traffic and our neighbours jet-turbine washing machine did for the skim what time and chemistry would have done anyway - gypsum and lime just don't bond!
We've got a lime plasterer coming next week to remove skim and work on repairs needed on the lime and lathe and plaster underneath - got a list of numbers from Historic Scotland's Conservation Bureau, for info, so that might be a good place to start - they're very helpful, and because what a lime plasterer wil see as a repair job is what a plasterer not experienced in lime might see as a rip it out and replace with plasterboard job, doing it 'right' could well work out cheaper than a gypsum skim job anyway, in more ways than one. There aren't many people around who do small domestic jobs in lime, but it's really worth finding them!
hope that helps...Good luck with whatever you're planning!