Spoon over the olive oil evenly on the sliced bread, then season each slice with salt and pepper.
On the large base slice of bread, lay the crispy bacon, sliced boiled eggs, chorizo and half the mayonnaise slices evenly.
Lay the next slice of bread on top, and then lay over the sliced corned beef.
Lay the next slice of bread on top and spread over the sliced tomato and the other half the mayonnaise evenly.
Top with the next slice of bread.
Finally lay on the beetroots
Top with the final crust.
Place the loaf onto a very large piece of foil and wrap the loaf totally.
Wrap in a second large piece of foil and squeeze nice and tightly.
Place onto a baking tray and pop into the oven.
Cook for 30-40 minutes.
Once cooked remove from the oven and press nice and tightly again, be quite brutal here, the more you press the better the chilled loaf will cut the next day.
Cool and chill well, best overnight.
Next day, remove from the fridge and take on your picnic.