Thatcher had a few redeeming features, e.g. the BBC Computer Literacy Project, the Enterprise Allowance Scheme etc. The impact of both are still hugely felt today. Much of the UK’s dominance in IT dates from this time, plus huge numbers of great businesses started on the Enterprise Allowance scheme in all fields e.g. games development houses, record labels etc. I’d describe the ‘80s UK hi-fi scene as inherently Thatcherite. Make of that what you will!
I don’t think you can find a single positive for David Cameron, Theresa May or Boris Johnson. Each one a 100% liability bringing only jingoism, division, poverty, visceral racism, corruption and vast inequality and economic damage.