hmm, i know of british and irish people eating blood puddings, rather the eastern european people i know were horrified to hear of it, i don't think it's very common over there.
about tattoos, it is tattooing yourself in a pagan ceremony to respect the dead that is forbidden.
not cross tattoos.
they are cool, and make complete sense when the majority around u are trying to stifle yr culture, crush yr faith and make u a carbon copy of them. it's a sign of resistance against an anti Christian occupying force.
it started when children used to be kidnapped from Christian homes by their non Christian neighbours. when they grew up, they would have the chance to discover their former faith and return. as the kidnapping of adolescent girls still goes on today in egypt, it makes sense for the tattooing to continue. Christians who do not (yet!) live under such harsh conditions can tattoo themselves in solidarity, if they wish (it is by no means compulsory in the coptic church).