Hi Christopher, the Valemont Dining Table is only available to order online from Dunelm I am afraid. They do have the black table in stock for delivery on the 29th, if you order today.
Assuming you need a table more urgently than this, I can only suggest you try argos where you should be able to buy something suitable in store either today or tomorrow.
Sorry I couldn't be of more help and I hope you manage to get sorted. Best wishes.