The full title of this piece is Tate Modern Under a Foggy London Sky. This was one of a handful of drawings produced in the development of the Oscar Francis Tate Modern poster.
The poster was commissioned by the Tate Modern Shop and can be bought on site and in the online store. At the time of the commission the new extension did not exist, so the first print sold did not include the extension. However, in early 2016 Sarah Evans was approached again to add the new extension and bring the poster up to date.
There are only 10 in the edition
£95 each unframed