This is actually quite simple. Does he contribute at least the same as you to the family pot? If so, you have absolutely no right to be angry. You should be thankful that you are both so well off and this money easily places you in the top 5%, if not 1%, of earners/households.
I think looking after family is fundamental. I completely believe that this is a generous and very attractive feature of someone. It's also very common in cultures, some places such as SA it's 'Black tax', in Chinese culture and other Asian cultures this is the thing you will definitely do.
And so what if you contribute more to holidays? If overall, your money and his money are somewhat equal, I am flabbergasted at the issue here. You're a family. Are you of the mindset that the man must pay for the woman?
It seems like you think that £2k you get should be yours which is absurd unless you went into the relationship with that agreement.
Additionally, with the will, is the house joint ownership/joint tenants? Depending on your house deeds, this will overwrite any will and upon death the other share of the house automatically goes to the wife/husband.
If the will is an issues, bloody speak to him. Don't have a go at him spending his hard earned money to look after the people that raised him and gave him the opportunities he now has, just say you're concerned about the family's future. Preparing a will is a very normal thing to do.