I wonder if you could step back and look at the bigger picture...I wonder if this is really about his £10k hobby...I don't think so, I think that's a symptom of two fundamentally incompatible approaches to marriage.
Do you think you two are a team where you make sacrifices for shared goals, especially when one person is already carrying more of the load, and where sacrifices and contributions should be reciprocal and balanced? It seems your husband sees your marriage not as that, but instead as between two individuals sometimes working in partnership via discrete and specific agreements with each other. In this example, he feels he has met his part of the agreement by paying the £1k, and feels his hobby is separate from your joint responsibilities so he won't enmesh the two by pausing it. He explicitly didn't want the renovation project ("I just wanted a new build") but has accommodated your preference by agreeing to it, and feels that his financial contribution is sufficient participation (and that your choice to do 90% of the renovation work doesn't create additional obligations for him). He feels your salary amount isn't anything to do with him either, and so also doesn't create any additional sacrifices or obligations for him. His hobby - his personal fulfillment and his wants and needs - is separate from any joint agreements he might enter into with you, and is non-negotiable.
Do you feel you are misaligned in your core beliefs about what marriage means, what fairness looks like, and what you owe each other? Does it show up in other areas apart from financial decisions? Neither of your approaches is wrong in isolation, but it's hugely difficult when you're married to someone with the opposite philosophy to you. I know this because I married someone with the same fundamental values mismatch. It's been so hard and truly miserable at times. I'm sorry to say that from my experience, every major decision in your future - kids, career changes, aging parents, financial setbacks - will trigger this same fundamental clash. It's hard living with, and trying to achieve joint goals with, someone who operates from a predominantly individualistic perspective.
Is it a deal-breaker for you that he thinks "me" and you think "us"? Can you genuinely accept his approach to your marriage?