Let's do the cost of living comparison:
Japan:
The Japanese average salary is 4.8 million yen, which is £22,500, their monthly take home is £1,575, and average rent is £375. Therefore, rent is 23.8% of earnings.
UK:
The UK average salary is £39,039, monthly take home is £2,606, and average rent is £1,374. Therefore, rent is 52.7% of earnings.
Then you have to think about daily costs:
Electricity and Gas
Japan: £75
UK: £137
Water
Japan: £15
UK: £53
Petrol:
Japan: 80p
UK: 157p
Average commute cost:
Japan: free - company pays
UK: £450pcm / £5,400 pa
Train trip into the city from suburbs:
Japan: £6.75
UK: £31 (off peak return)
Healthcare:
Japan:
£100 per month - no waiting list, better than UK private
No GP - go straight to specialist on the day on a walk in basis
-Visit to ENT for a strong cold/flu: £15
-Open heart surgery with 21 day hospital stay:
£550
UK:
Free at the point of use -
-Visit to GP for a strong cold/flu: phone call after online triage
-Open heart surgery:
9 month waiting list with 3 day hospital stay - discharged from ICU to home
Lung Cancer 5 year survival:
Japan: 45%
UK: 21%
Heart attack:
3 month mortality rate
Japan: low
UK: 2x Japan
House prices
(40 min commute from capital):
Japan: £165,000
UK: £404,000
Elite private school fees:
Japan: £17,900 pa
UK: £42,000 pa
University fees:
Japan: £2,500 pa
UK: £9,790 pa
Average student debt:
Japan: £7,140
UK: £50,350
And fun stuff:
Eating out - £15+ gets you a great meal but even £3 gets a bowl of noodles.
Winter sun: (Dec-Feb)
Tokyo: 5.8 hours per day
London: 1.6 hours per day
Days of rain:
Tokyo: 100 per year
London: 150 per year
I lived and worked there many times over the last 30 years, for years at a time (new grad, mid career, with family, etc). My last stint ended last year. The UK has many compelling reasons for residence, but the cost of living is not one of them!