Had to come back due to COVID-19, hadn't been away for as long as some posters here. But still a reverse culture shock.
Good points: to have the NHS as a safety net when there is a crisis is fantastic, I just hadn't appreciated the NHS when I was in the UK before.
Also the cost of living, I was in a country where the cost of living was very high so accommodation is much cheaper in the UK, and food! So much cheaper for me. Can get items more easily, such as furnishings, foodstuffs and so on (I was very remote before, not much choice for anything). Home deliveries in the UK, not all countries do this, and certainly no home visits from the doctor (although during the pandemic this hasn't been an option). People have been friendlier in the UK on my return, it was very difficult to integrate into society overseas, it needed a look of effort. I'm now surprised how easily people speak to strangers in the UK, it's nice.
Negatives: struggled in my head to get the language right (English is my first language). When I first arrived back, if I spoke to anyone I used English easily but if someone asked me a question I would start answering in another language. Took a while to wear off.
Definitely odd crossing roads, I still can't work out which direction the cars are coming from. Also driving, spent a lot of time going very slowly down country lanes to practise before I got the hang of driving in the UK again.
Weird sense of having to learn to fit back into my own country and feel part of the community again. Other people explaining things to me that I know perfectly well about, eg. BREXIT as it happened while I was away....but yes, I was following it.....!
Also missing things from the other country. I really miss having mountains around me and also the "right to wander" - in the UK you can't walk just anywhere you please, everything is all fenced off, I didn't realise how constraining I would find this when I returned.
In addition, my family seems to have 'moved on' without me. I was unprepared for this. When I returned I came back to live much nearer family members. I fondly imagined they'd be so pleased to have me back and I'd probably see them every week. In reality they are used to not having me as part of their plans and so don't include me unless I ask; they are not being unkind, they just don't remember I'm around now....