Is there any way to check what gulp version you have installed?

Simply use: gulp -v

From the docs:

https://github.com/gulpjs/gulp/blob/master/docs/CLI.md

gulp -v will not work if you don't have gulp-cli installed (you will get the error 'gulp' is not recognized as an internal or external command, operable program or batch file.).

So 2 options:

1. First run npm -g install gulp-cli then run gulp -v
2. Alternatively, you can just run npm list gulp