Oh I love b&b pud. This is how I make it, its probably wrong but it always tastes good!
I get a pint of blue milk, a small carton of double cream, pour in to a mixing bowl, add 4 large eggs, some vanilla (I use paste but I'm sure essence would be fine). Mix with a fork until the egg mixes in. Butter your bread on both sides, really generously! Grease your dish and put a bottom layer of bread, grate some nutmeg over, sprinkle some cinamon and sugar over and a hand full of rasins aand pour some of the egg mix on just enough to cover the bread, then do the same again until you fill the dish, add a good sprinkling of brown sugar and cinamon on top.
PUt it in the fridge for about an hour so the bread soaks up the mix, then cool in the oven for about 35-45mins on about 190, sorry I don't know the gas mark.
LEt me know what you think if you give it a go!!