steak is very tough and not ideal
A nightmare isn't it, your best bet is to buy a whole vac packed fillet (99zl kilo) from Tesco and cut it into steaks, pack individual then freeze until required, keep the chateaubriand piece and roast it, brilliant.
Not seen any rib-eye to talk of here, but Kaufland sometimes have some interesting beef cuts .
On the whole (Apart from tesco and lidl) they don't really have a clue about ageing beef, but its getting better.