The most recent (2017) regional GDP estimates calculated by
Eurostat, the EU civil service statistics authority, suggest the following:
[2]
Region GDP (trillion $) GDP (trillion €) GDP (trillion £)[3]
Total UK GDP: 2.5 2.3 1.8
Great Britain:
2.4 2.2 1.7
England (including London): 2.2 2.0 1.6
England (excluding London):
1.6 1.45 1.1
London: 0.6 0.55 0.43
Scotland: 0.2 0.18 0.14
Wales: 0.09 0.08 0.06
Northern Ireland: 0.06 0.05 0.04
This would make the economy of England taken alone (£1.6tn / €2.0tn) approximately the world's 8th largest economy (just behind France, and ahead of Italy) as opposed to the 6th largest for the UK as a whole (between India (5th), and France, 7th) by the usual criteria. Scotland's economy, for comparison, would be roughly the size of Hungary's (54th).