Thatcher designed herself to be ruthless. There will always be the question of whether she forsaw the world coming or simply wanted to replicate the US/Reaganomics, but the facts are that she destroyed the working class, destroyed the concept of unions entirely (they were not blameless BUT she saw an opportunity to smash them entirely and grabbed it) plus she opened the door for the private sector to s off utilities and other necessary public services. Labour came in after Heath had buggered about and were immediately slapped in the face with an economy going the 'wrong way' and soaring inflation. BTW don't forget Heath's contribtuion to striking miners - the three day week - which sent a 'fudge you' message rather than ay willingness to discuss/compromise. I'd argue that with Callaghan having to deal with the inflation issue (wages simply did not keep up) we saw the discontent spreading. Thatcher came in with a loud, fresh message (I'll never forget her 'Labour's Not Working' posters with that long unemployment line photographed against a white background - designed by Saatchi & Saatchi) as it was the first time I'd seen politics manipulated in the way consumer goods are all the time by advertising to suggest an 'emotion' we should be having (it still sadly works as we saw with the Brexit bus sham). What she did in terms of housing was actually terrible if you believe in a society, but as she made clear, she didn't believe in it as a concept. Her adoption of more hardline policing (SPG and so on) showed a tip of the hat to her old mate Pinochet, and for me, the unpsoken truth of the '70s 'winter of discontent' is that business owners started to see the opportunity to lessen the power of their workforces, and as such, started to force poorer working conditions. Again, it is well worth saying that the unions should've been smarter and seen it coming earlier, maybe taken a softer approach to their work and relationships too as they did have a lot of power. But you could also say that any concession given to Thatcherite thinking and supporters would not have been met with compromise or even recognition. Heath came in 1970 trying to give tax cuts to big business and carping on about a general 'anti state' approach to things, but it failed. So honestly, I think you can blame the Tories for most of it.
The interesting part of the discussion (for me) is still whether she saw it coming or was simply ruthless. I believe she had a hatred of the working class, despite herself having come from such stock and actually being such a tireless worker herself. I think she genuinely thought that people were inherently lazy and that society had no obligation to it's populations, that if you had little it was because you were lazy (try saying that to underpaid miners who worked their fudging arses off for tantamount to fudge all).
I despised her then just as I do now. It doesn't mean I can't objectivelt agree that she single-handedly changed British society, and that was quite an incredible action with regards to the extent she did...I just despise how she single-handedly waged war on the working class and used them for all her big 'victories'...we should also never forget that the Falklands invasion did not need to happen. Carrington had provided intelligence months earlier that it could happen. She knew she was out that election, so it seems clear that she gambled a jingo-bells Falklands invasion rather than quietly take care of the threat with preventative measure (full disclosure, I think us 'owning' the Falklands is pathetic personally). I'll stop now...