Yes, unfortunately I have tried all usual passwords. I use the same couple of passwords for everything which also adds to my suspicion that I didn't set it l. If I had it would be one of my normal ones.
Does electrum lock your wallet of you have a certain amount of failed password attempts? Ie can I keep guessing without fearing locking the account? and is it possible electrum could have applied a default password?
Short answer: No, Yes and No
It won't lock you out. Also, as the wallet is not encrypted, you can also try running one of the password recovery scripts on it... so, no need to worry about it being locked out. If you're concerned, just make a backup of the wallet file somewhere.
Electrum will not have set a default password. It doesn't do that. You will have had to have entered something twice to get it to generate the wallet. It doesn't enforce any rules on password length or complexity, so you could have just put 1234 or abc or password or even just a space.