Out of pure curiosity I enquired within the Oxford English Dictionary online and found these gems:
Manch. Guardian 2 Apr. 3/3
In the houses of some ignorant people, a Good Friday bun is still kept ‘for luck’, and sometimes there hangs from the ceiling a hard biscuit-like cake of open cross-work, baked on a Good Friday, to remain there till displaced on the next Good Friday by one of similar make.
Best flour biscuits are made on Good Friday, to be kept as a year's supply for grating into milk or brandy and water to cure the diarrhœa; and with holes in the centre, we have seen ‘Good Friday biscuits’ hanging from the ceiling.