Crush, peel and chop the garlic and place in a saucepan with a little of the oil and all the bacon and potato. Sauté gently over a low heat for 8 minutes, without browning.
Add the stock, herbs and seasoning, bring to the boil and simmer for 30 minutes. Remove the herbs and add the remaining oil. Blend rapidly with a hand-held electric blender until smooth and emulsified. Check the seas