To expect ExH to do any job to pay some child maintenance

[meikyo]

ExH has worked for about 18 months in the last 13 years. He is currently unemployed, has been for over a year. He sees DD regularly, has every other weekend. He paid me 12p CM in the last 12 months.
ExH was qualified for a specific role which is now no longer available in the UK. Before we split I supported him to retrain in another type of work, but he was unable to hold down the job as he went off with stress on several occasions. He has been treated for this and has been very well for years now. Surely he should be able to find and keep some job? He gets aggressive and defensive if I ever ask how the job hunting is going.
Fortunately for DD I have a reasonably well paid job, but I resent being out of the house 50 hours a week when exH doesn't even do voluntary work?

Yes he is a disgrace, and it's not unreasonable for you to expect more of him. However, I can't see how you will be able to make him change his ways. You could try pointing out that his idle way of life is setting a bad example to his child. Perhaps that will encourage him to get off his backside.