I'm unable to customise my team because, whenever I select Customise, Manage Teams, the only option I have is Create Team. It recognises that I have an existing team with the same name if, I try to create a team with the name of my existing team. Also, when setting up a game and selecting team, choosing Edit shows all editable options as greyed out. Anyway to resolve this?

After you have pressed 'Manage Teams' you should simply select an existing team and press the A-button.

About the second question... I didn't quite understand it. Could you explain it a little bit further?

I select Customise and choose Manage Teams. On the Manage Teams screen I see the Manage Teams title and directly below that is the only option Create Team - I don't have any option to choose a team - apart from that I just see the standard Select A and Back B at the base of the screen.

It must have been working at some point because, I have a team that I've previously created but, it's been at least six months since I played the game and I only started playing it again recently when the Battle Pack was on special offer.

If I select Create Team and choose the team name of the team I created some while ago then, it recognises there is a team already with that name and will not allow me to create it. So, the game is recognising it on some level and I can choose that team for games, I just can't edit it.

It wasn't a second question but, more information which may help with this problem. When you select a Campaign or match, you have the option to choose a team and you can press X to Edit the team, when I select my team and press X, all of the options are greyed out - this applies to any team that I choose.

the Manage Team menu should look something like this:

Create team
(Teamname) < this shows your current team. highlight+click to edit it.

as for the Edit team option at the start of games, this menu is usually only used for custom / private matches so you can select less worms or team color. its not really used for campaign.