I have a terrible feeling that the seed i have is one from another wallet and not an electrum wallet seed at all as i have several and may have muddled them up..!
i do have an electronic document with loads of seeds and keys and passwords but as you can guess its on the H/D and im hoping i can recover it!
Then what you stated is probably the cause of your problems, and the problem you have comes from the fact that you mixed key data with which you need to be extremely careful. Another big mistake is that you kept that information on your hard drive, and in a particular case, as you can see, is not a smart move. Also, if the document was not encrypted, you were exposed to possible hacking, not only from online threats, but also from anyone with access to a computer. Good luck with recovery.
@HCP it's probably out of scope but there could be a chance a clipbload virus changed the seed or a chance of something else happening (i.e an old version of the wallet with some vulnerabilities or something)...
Clipboard malware can only change the coin address, where did you get the idea that it could change seed and what would be the benefit of it for whoever would do it?
I only set this up less than a year ago.
A year ago he could only download version 3.3.4 which is released February 13, 2019, and that version is safe almost as latest 3.3.8.