By reading the Gmail help pages it looks like you can delete your email account without losing access to everything like Youtube, Play, etc. However I managed to find a phone number for Google Play and called that and spoke to someone there. He told me that if you delete your email account you WILL lose everything associated with the Play store.
Conflicting information on Googles part it seems.
I have been getting tons of spam sent to my address without a dot (myname@gmail.com instead of my.name@gmail.com), its as if someone doesn't know their own address or something. I even had emails from a solicitor regarding a divorce, it was a genuine company not a scam/spam link - I managed to contact them and they had got the email address wrong.
On advice from Google, I now have a filter set up so that everything I receive that doesn't have the dot in goes straight to the bin.