I've been back in the UK for almost 6 months.
Good stuff in the UK:
Choice of food, and superior quality of food (especially compared with China). After living in China, I appreciate how important good food is to my life.
The economy is booming here - maybe the strongest economy in the world right now. If you want work, it's here.
After a false start, I have a really fantastic job.
Free healthcare.
Bad stuff:
So many migrants here now. Not so good if you're young and/or need entry level work. Immigration was a huge issue for the many working class Brits I talked to in Bangkok and Pattaya. Of course I was an immigrant in China and Thailand, but I never worked there, and neither was it as easy to find a job there (except for English teaching).
Work wears me down and I don't have much time for stuff like dating.
Our World Cup football team!
Differences I've noticed with myself:
I am definitely more confident.
I no longer care about "first world problems". I still rage sometimes, but mostly I walk away.
I live in a really noisy house, but I've picked up that Asian thing of not noticing/caring.
I'm starting to be able to sleep any time, any place. Also an Asian thing.
I'm better at handling a crisis.
I've bought hardly anything since I've been back, except for a new phone. I'm stockpiling cash for Xiongmao returns to Asia

Having the balls to walk out of my last job was really character building. Everyone needs to do this at some point in their lives.
I have so many stories to entertain people with. It's kind of rare to meet somebody who's lived in China. I met some stupid people in Thailand (HA members excepted!) but the foreigners in China were VERY smart indeed.
Most of my friends I talk with most are people I met last year.
I would think that I have now achieved a compromise in life. I did want to go abroad for 5 years or more. Now I plan to work for 2-3 years, then when a job runs it's course, I'll go abroad until it's time to come home. Last year's spell in Thailand when I coded by day and did stupid stuff by night worked very well. Anyway, if anyone else has a career in which you can do this, then give it a go. It could be a better option than going down the English teaching route or trying to save every darned cent.