Having the same issue as last year... Now the cold mornings are here in the UK every time the temperature drops below 0 I have a job starting the car in the morning. I replaced battery last winter and there is nothing wrong with that. I found a trick on youtube putting warm water on a certain part (under the main engine bay) but this means taking off the oil cap and faffing about. Plus don’t know if it’s a good idea Any solutions??! PLEASE

Could be the glow plugs have failed. By all accounts a right pita to change with danger of them snapping meaning cylinder heads off. You would probably want to have them checked. Someone, Robbie?, did a great post on the Disco3 forum, maybe in the wikki

Glow plugs are at fault