Posh macaroni cheese

This rather splendid macaroni cheese had fat pasta tubes, hunks of smoky ham, rounds of leek and a cheesy sauce. I can't however recall whose kitchen it came from, I suspect it was Mr. Marks and Mr. Spencer's. My only role was to pop it in the oven to let the top brown attractively, liberally grind some black pepper over it and consume happily. I am rather a fan of a macaroni cheese and this was not a bad exponent of that fine dish, I thought the ham would be a little more prevalent but it lacked a certain je ne sais quoi! However it was an undemanding comfort dish, both to bake and to eat. Any sometimes, that is exactly what you need!