I can see how that might be difficult and cause some tension and worry. It sounds as if your H is having an extended mid life crisis!
In your situation, I would be be tempted to take a different tack
Don't despair; savings are after all, only one way of storing up wealth. Tax efficient, yes but there are alternatives.
If you are buying a house, (but perhaps you are renting) there's a secure store of wealth there, especially if it's in a nice area. It can provide an income in old age through equity release or downsizing.
H needs a nice shiny new car? Well of course, you do, darling - but what about me? Well, I need some lovely shiny expensive new, gold jewellery - and lots of it. Some for Christmas, and more for birthdays, and of course some to wear for those expensive hotel dinners.... Gold is one of the oldest and most reliable stores of wealth - and your H can hardly spend it easily once you have it.
And it's not too late to start building your own pension pot - even if you don't have paid work. Some schemes take a minimum payment of just £16 a month - topped up to £20 by tax relief.
In the meantime, just relax and enjoy the benefits of the nice lifestyle.
There's more than one way to skin a turnip....