May Ross Lamb Shanks

4 large lamb shanks (preferably French cut, but not essential)
2 Tbls. flour
salt
pepper
oil
1 large onion, finely diced
1 rasher of bacon, finely diced
1 minced clove of garlic
1 Tbls. ketchup
1 Tbls. soy sauce
1 Tbls. Worcestershire sauce
1 Tbls. brown sugar
1 tsp. dry mustard
1/4 cup