Rub the plain flour and butter together in a bowl until it looks like breadcrumbs.

Split the mixture equally between two bowls.

In one bowl add the cheddar and mix well to break the cheese up into small pieces.

Add 1 egg yolk and mix in. Add a little egg white to bring it together to form dough.

In the other mixture add the Marmite and 1 egg yolk. Again add some of the egg white to bring it together to form a dough.

Roll out both doughs separately onto greaseproof paper until they are a similiar size.

Placed the Marmite dough over the cheese dough.

Roll the doughs into a tube.

Wrap in cling film and chill in the fridge for about an hour.

Using a sharp knife, slice up the tube of dough into pieces about 8mm thin.

Place onto a baking tray lined with baking paper.

Bake on 180C/350F/Gas Mark 4 for about 20-25 minutes until golden brown.