Stratospheric I should imagine!
Stale bread, mixed fruit and sugar+ a bit of spice milk and egg, some people add suet which adds to the fat content.
If you make it yourself you can look up the carb counts for the bread, fruit, milk and sugar in the recipe add them up and divide by the number of portions.
(a quick google found livestrong suggesting that it had 52g carbs for a 110g portion, which sounds about right)
I thought that was bread and butter pudding