I've just made Delia's Christmas Pudding Recipe again as it is always such a great recipe. I make 2 largish ones and a smaller one from the full quantity recipe. Delia's instructions say to pack the mixture to the top of the pudding basins, but I found in the past this leads to the mixture leaking slightly. To prevent this I now only fill the basins to within about one inch, which means I make the three puddings as I mentioned above. I just wondered if you could offer any advice about this please.