We made this a couple of weeks ago and liked it so well we gave it another go yesterday.  We had it for lunch and again for dinner.  Instead of bacon we used a smoked hock that we boiled for a while in broth before putting the soup together.  The leeks sweated down in butter in another pot before adding the potatoes and the broth.  I kept the hock out to cool.  After the soup was cooked and blended  the diced meat from the hock was added back.