Reducing subdivision amounts (UK, Thailand, etc.)

The current division of France is done into the 22 regions. The rest of the regions are overseas territories. As those are the official ISO 3166-2 subdivisions of France, and comprise of meaningful sized and officially used regions, I don't think those should be changed.

Brazil isn't among those that I would see as a problem.

The point in here is to reduce the amount of subdivisions in areas, where the amount of subdivisions is extremely high compared to the surface area of the country.

United Kingdom: 231 subdivisions, 245,610km2 == 1055 km2/subdiv.
Thailand: 77 subdivisions, 513,120 km2 == 6664 km2/subdiv.
France: 37 subdivisions, 22 in Metropolitan France, 551,695 km2 == 25,100 km2/subdiv.
USA: 57 subdivisions, 9.8 million km2 == 172,000 km2/subdiv.
Russian Federation: 83 subdivisions, 17 million km2 == 205,000 km2/subdiv
Brazil: 27 subdivisions, 8.5 million km2 == 315,000 km2/subdiv.

Do you see the point with UK and Thailand? And also why e.g. France and Brasil do not need the reduction, but countries like UK and Thailand would need the reduction.

Would this division make sense to people in UK?

East Midlands
East of England
Greater London
North East England
North West England
South East England
South West England
West Midlands
Yorkshire and the Humber

West Wales and The Valleys
East Wales

Eastern Scotland
South Western Scotland
North Eastern Scotland
Highlands and Islands

Northern Ireland

Like this?

North Wales (Gwynedd and Clwyd)
Mid Wales (Dyfed and Powys)
South-West Wales (Glamorgan)
South-East Wales (Gwent)