Nonresidents such as travellers and tourists currently on a visa in the UK, cannot file their visa application at the Schengen embassies in the United Kingdom. Instead, they should apply for a Schengen visa at the appropriate Schengen embassy in their home country. https://www.schengenvisainfo.com/apply-from-uk/
https://www.schengenvisainfo.com/apply-from-uk/
所以你的情况是无法在英国申请申根签证旅游签证的。
另外提醒你 英签旅游签证是半年停留期,你有没超?