SVG image of Union Black by Chris Ofili: a British flag altered to use the pan-African colours. Part of a series with pan-African colours by Ofili first shown in 2003 at the British Pavilion of the 50th Venice Biennale, and subsequently flown from the Tate Britain on various occasions. Since 2017 the flag has been owned by the Tate Britain; according to a press release; it was donated by the artist.
"Union Black" is the name of the artwork by Chris Ofili: the Union Jack in pan-African colours; the original (2002) now in the Tate Britain, London (since 2017).

The press release gives the dimensions as 130 x 267 cm or 51 1/8 x 105 1/8 in. According to the Tate Britain's catalogue, the whole flag measures 1445 × 2590 mm, corresponding to a 3:5 ratio.
20210725004624%21African_Britain_Flag.svg
Chris Ofili; this SVG version by GPinkerton as modification of File:African Britain Flag.svg by SpinnerLaserz.