VideoJug has a growing section of parodic how-to videos on relationships. They offer a mix of humour and serious (?) advice, and are very, very British.
I found their guide on How to be the Perfect Girlfriend via Reddit. (I think the text or audio is from a BBC1 radio broadcast):
VideoJug: How to be the Perfect Girlfriend
Here’s the complementary video on How to be the Perfect Boyfriend:
VideoJug: How To Be The Perfect Boyfriend
I wonder how long before these humourous videos outnumber the more serious how-to videos.