Learning traditional Chinese characters (geared towards kids but adults could benefit as well)
http://hhsscicanwriteicanread.weebly.com/
Comprehensive forum on Cantonese, from vocabulary to discussion:
http://www.cantonese.sheik.co.uk/
Cantonese Meetup Group (London)
If you need help inputing Chinese characters:
http://www.cantoneseinput.com/
Chinese characters to jyutping:
http://humanum.arts.cuhk.edu.hk/Lexis/lexi-can/
Where I teach
Cantonese Summer Camp 2018:
https://www.cantonese-summercamp.co.uk/
Chinese Independent School of Tower Hamlets:
http://www.cis-london.co.uk/Contact-Us.html