I always thought I had a fairly equal household
I work from home, full-time hours, in a somewhat less demanding job. But then I do everything else aswell.
I'm not sure the word equal means what you think it means. I work long hours, very demanding job. DW works 2 days, in a job she'd describe as undemanding. I would hang my head in shame if I did as little as you describe your DH doing.
I don't pick up 50% of the financial load in my house, maybe 1/3?
What on earth does this have to do with anything? Are you a paid employee? If you are bean counting the money and hours you both it in, then it's doomed. Marriage is a partnership- at times you will both carry the other without expecting payback.
I do think he needs a massive kick up the arse.
I apologise for being rude, but you're kicking the wrong person. You've made these choices, you are the one who keeps doing it. It doesn't sound like he even knows there's an issue. Perhaps he assumes you like it this way :-)
No point throwing blame, sit down together and speak like adults. Come up with really clear plans and stick to them. Expect him to pull his weight and accept nothing less, because (presumably) he's a decent, competent human being and will want to fix the problem.
Your husband sounds like an angel! Ah ha, ha, ha, ha.