I got this working on Win10 using a combination of the answers from above and elsewhere. Posting here for others and future me.
I followed the instructions from here: https://gulpjs.com/docs/en/getting-started/quick-start but on the last step after typing gulp --version I got the message -bash: gulp: command not found
To fix this:
Also, found the below for reasons why not to install gulp globally and how to remove it (not sure if this is advisable though):