Carla. If concrete is too expensive, there are other ways to achieve the rough luxe look if that is what you are going for?
If it is then have a look at sites like Houzz.com for stainless steel worktops. If done it the right way and paired with the right sort of kitchen units and elements of wood, you can get the look that way. And stainless steel worktops even the bespoke made, are quite inexpensive compared to other types.
Another option is slate. But and it's a big but slate will develop a patina. You cannot really seal slate and its softer so it will end up with marks from knives and other implements and scratches.
Again could work well with rough luxe look though as long as you are comfortable with a worktop with a distinct patina.
If not then look at granite again but not polished. Look at getting honed granite. It could work too. If you go to a proper stone mason rather than all those basic kitchen worktop people who have a limited choice of granites. A proper stone mason can get you any stone you like and you can even chose the actual slab before you buy. And they can have it finished it which ever way you like (ie honed or satino)
Have a look at Pisani. They are one of the UKs biggest importers of stone. My 40mm marble worktop came via them and I had it honed (most stone arrives polished in the UK so you will have to ask to have it honed etc). You can visit Pisanis yard out at Heathrow to see their stock. It's amazing.
Bruges. It needs to be cast in situ. If it goes wrong you will probably ruin your kitchen units completely.
Is your DH a trade who works with concrete? If not and he is an obsessive DIYer, it wouldn't do given the damage you'll end up with if it goes wrong.