Hot cross bun-and-butter pudding

At last, a use for supermarket hot cross buns. The hot cross buns at Borough market are a revelation; rich, dense, moist, fruit and spicy. Even 4 days later, there's no need to heat them up; they're just lovely buttered cold.
Unfortunately, I'd already bought some from waitrose, and couldn't bear to throw them away.
Recipe books are full of variations on the bread-and-butter pudding theme: brioche, pain-au-chocolat, crab sandwiches even. No-one seemed to have covered hot cross buns before, so I had to wing it as regards quantities.
The remains of a beaten egg (from pastry brushing), some top-of-bottle, a few pointless sultanas and demerara sugar were all that I added to two hot cross buns cut-and-buttered vertically in several slices.
Miracle! It worked. Normally Hungerpang experiments, and I work from recipe books. In his absence, I had to take on his role, and learnt that you get lucky quite often.