I would’ve thought that thick warburtons stuff is a bit too thick for the innards to get properly melted?
Ive heard that stale warburtons makes ideal lagging for hot water pipes/boilers etc, just damp it down a bit and slap it on, the mice wont eat it they`ve got more sense.
I knew a lad who worked at Warbies in Shaw near Oldham, at lunchtime he would buy a deformed uncut loaf for 10p, scoop out the middle and take it across the road to the chippy, they would fill it with chips and gravy, the bizarre thing was he was then and still is a racing snake.