Soak split peas for about 6 hours- overnight is good. Drain and rinse. Add to a large pot with fresh water, bring to boil and then simmer gently (for ages) until peas start to break down. With this dish- if it gets to thick, boil the kettle and add more water.
In the meantime you can throw you leek, carrots and celery in a large fry pan and fry until they soften (not brown). When peas have started breaking down add the softened veges, along with potatoes, ham and bones, bay leaves. Keep it gently simmering for about an eternity (the longer the better - 2 hours plus) until it thickens and the aroma makes you salivate.
Remove ham, chop or rip up and throw back in. I like to leave the bones in- very nice to suck on a tasty/salty little ham one whilst eating your soup! Season with cracked black pepper to taste, top with some chopped celery leaves and serve with crusty white bread. I think this one is a winner- Enjoy!