"What other options do I have"
Its as short as stay or leave. You have tried talking to him and it clearly has not worked. This is also because he is happy as he is. He likes seeing you short of funds, it gives him power over you. Abuse is about power and control, its not about a lack of communication.
"The bills/ mortgage aren't in my name anyway"
Not surprised at that. There is little to no financial transparency here in your relationship and he has a vast amount of power when it comes to the finances.
"Most recently he spent over a grand on alloys with no discussion"
Not surprised at that either, his earnings are his alone in his mind to spend as he pleases.
You stated that his salary goes into his account; is it the case that from that account he then divvies out some money to you for the joint account?. Why is he at all dipping into that when he has his own account anyway?
I have noted that you give him a head's up if you make a big purchase (which I would think you never have done anyway) so there are double standards here. Also he hates you spending money, I am not at all surprised that you owe money on the credit card (and that is a deliberate move on his part as well). It keeps you where you are now.
"I do have a habit of concealing things if I know I'm going to get into trouble iykwim"
Why did you kick yourself so for forgetting to shred the credit card statement?. Where did that mind set above really begin, where has this got its roots in?. I think you need to think on that some more and work out the root causes of that.
What do you get out of this relationship now?. You get something out of it so what exactly is it?. What needs of yours are being met here?
Would you want your children to have a relationship like yours now as adults? I should think not. What do you think they are learning from the two of you about relationships here?