2021-22 Annual Population Survey says the following constituencies have Blacks in double % figures

[Tooting Carmen]

Be they Black Caribbean, Black African or Black Other. Once again, the constituencies outside London are highlighted in bold.

Edmonton (Outer London) 38.8%
Camberwell and Peckham (Inner London) 36.9%
Croydon North (Outer London) 31.6%
Birmingham Ladywood (West Midlands) 31%
Erith and Thamesmead (Outer London) 25.6%
Barking (Outer London) 24.8%
Streatham (Inner London) 23%
Tottenham (Inner London) 22.8%
Bermondsey and Old Southwark (Inner London) 21.4%
Hackney North and Stoke Newington (Inner London) 19.8%
Lewisham East (Inner London) 19.8%
Coventry North East (West Midlands) 19.6%
Dulwich and West Norwood (Inner London) 19.4%
Hackney South and Shoreditch (Inner London) 19.2%
Dagenham and Rainham (Outer London) 18.8%
Greenwich and Woolwich (Outer London) 18.4%
Hayes and Harlington (Outer London) 18.3%
Brent Central (Outer London) 16.8%
Lewisham Deptford (Inner London) 16.8%
Hendon (Outer London) 15.7%
Islington North (Inner London) 15.7%
East Ham (Inner London) 15.5%
Ealing North (Outer London) 15.3%
Croydon Central (Outer London) 14.1%
Walthamstow (Outer London) 13.6%
Birmingham Perry Barr (West Midlands) 13.4%
Birmingham Erdington (West Midlands) 13.4%
Leyton and Wanstead (Outer London) 12.7%
Manchester Gorton (Northwest England) 12.6%
Holborn and St Pancras (Inner London) 12.3%
Luton North (East of England) 12.2%
Nottingham North (East Midlands) 12.2%
Sheffield Brightside and Hillsborough (Yorkshire and The Humber) 12%
Leeds West (Yorkshire and The Humber) 11.6%
West Ham (Inner London) 11.5%
Manchester Central (Northwest England) 11.2%
Leeds Central (Yorkshire and The Humber) 11.1%
Vauxhall (Inner London) 10.8%
Walsall North (West Midlands) 10.6%
Slough (Southeast England) 10.3%
Poplar and Limehouse (Inner London) 10.3%
Enfield North (Outer London) 10.2%
Mitcham and Morden (Outer London) 10.2%
Thurrock (East of England) 10.1%
Brent North (Outer London) 10.1%

[Andullero]

Be they Black Caribbean, Black African or Black Other. Once again, the constituencies outside London are highlighted in bold.

Edmonton (Outer London) 38.8%
Camberwell and Peckham (Inner London) 36.9%
Croydon North (Outer London) 31.6%
Birmingham Ladywood (West Midlands) 31%
Erith and Thamesmead (Outer London) 25.6%
Barking (Outer London) 24.8%
Streatham (Inner London) 23%
Tottenham (Inner London) 22.8%
Bermondsey and Old Southwark (Inner London) 21.4%
Hackney North and Stoke Newington (Inner London) 19.8%
Lewisham East (Inner London) 19.8%
Coventry North East (West Midlands) 19.6%
Dulwich and West Norwood (Inner London) 19.4%
Hackney South and Shoreditch (Inner London) 19.2%
Dagenham and Rainham (Outer London) 18.8%
Greenwich and Woolwich (Outer London) 18.4%
Hayes and Harlington (Outer London) 18.3%
Brent Central (Outer London) 16.8%
Lewisham Deptford (Inner London) 16.8%
Hendon (Outer London) 15.7%
Islington North (Inner London) 15.7%
East Ham (Inner London) 15.5%
Ealing North (Outer London) 15.3%
Croydon Central (Outer London) 14.1%
Walthamstow (Outer London) 13.6%
Birmingham Perry Barr (West Midlands) 13.4%
Birmingham Erdington (West Midlands) 13.4%
Leyton and Wanstead (Outer London) 12.7%
Manchester Gorton (Northwest England) 12.6%
Holborn and St Pancras (Inner London) 12.3%
Luton North (East of England) 12.2%
Nottingham North (East Midlands) 12.2%
Sheffield Brightside and Hillsborough (Yorkshire and The Humber) 12%
Leeds West (Yorkshire and The Humber) 11.6%
West Ham (Inner London) 11.5%
Manchester Central (Northwest England) 11.2%
Leeds Central (Yorkshire and The Humber) 11.1%
Vauxhall (Inner London) 10.8%
Walsall North (West Midlands) 10.6%
Slough (Southeast England) 10.3%
Poplar and Limehouse (Inner London) 10.3%
Enfield North (Outer London) 10.2%
Mitcham and Morden (Outer London) 10.2%
Thurrock (East of England) 10.1%
Brent North (Outer London) 10.1%

Are they mostly of Caribbean extraction or continental SSAs?

[Tooting Carmen]

Are they mostly of Caribbean extraction or continental SSAs?

A bit of both. It used to be mostly the former, but nowadays is increasingly the latter.