I think it is kind of a scary plan, a make or break plan. But if you want different things well..
I read your opening post first and only just realised it was a few months ago. Anyway, we returned in January after five years. We were very happy in Australia, previously happy in UK, but the work in Australia dried up and prospects were better, for us, in the UK.
Settling back in has been simple, much easier than going the other way as you would expect. We moved back into our own house, had jobs lined up and just slotted right back in. My house is smaller here, but I like it and find it cosy. We are still indoor camping as we wait for the container and it is an excuse to spend one or two evenings a week in the local country pub which has a lovely atmosphere.
I had maybe convinced myself it goes dark at 4pm here but I haven't been finding it particularly dark here in the south east. Last night I left work at 5.30pm and it was still light. I am looking forward to the long days in due course. Winter has also been easy so far, seen snow once and I haven't even used an umbrella that much, maybe no more than half a dozen times.
So all up, it has been easy peasy. But I expect there will be a honeymoon period and I will miss Australia. I shall probably try to block it out and look forward now though.