Chestnut and Bacon Soup - Cooking like a Boss

1 tbsp 0.015 l 15 ml 3 tsp 0.063 cup 0.026 pint olive oil	melt		cover and sweat over low-medium heat for 5 minutes	cook for 5 minutes until veg tender but not coloured	simmer for 30 minutes	remove bay leaf and thyme	blend until smooth
25g 0.025kg 0.055lb 0.882oz butter
1 small onion	chop
1 small leek	trimmed and washed	chop
1 stick of celery	trimmed	chop
1 small carrot	chop
1 clove garlic	peeled and crushed
1 bay leaf
1 sprig thyme
6 rashers smoked bacon	dice
300g 0.3kg 0.661lb 10.6oz potatoes	peeled and cut into chunks
1l 1000ml 66 ²⁄₃tbsp 200tsp 4.23cup 1.76pint veg or chicken stock
400g ²⁄₅kg 0.882lb 14.1oz cooked and peeled chestnuts