What if Thatcher had lost in 1979?

I'm generally very interested in the Thatcher era, being a born-in-the-eighties Thatcher baby myself. What with the excitement about Meryl Streep's new movie, and the current striking etc. in the UK, it got me thinking - what if Thatcher had never become Prime Minister?

Would BT, railways, unions etc. have remained safe, or would it have all happened under some other Tory? And who would that Tory have been? Heseltine, Clarke, Major?

What would the story in Scotland be like? Would devolution have ever happened?

Very interested to hear some perspectives from more knowledgeable minds than mine own.