LONDON, April 10 \ufffd Should it be slithery or scrunchy, glutinous or grilled? The answer, British scientists say, may be divined by a formula: N = C + {fb(cm) \ufffd fb(tc)} + fb(Ts) + fc \ufffd ta.

That is the scientific answer to the question: what makes the perfect bacon sandwich?

And, no, it is not April 1.

Researchers at Leeds University spent more than 1,000 hours testing 700 variants on the traditional bacon sandwich, which many Britons refer to as a bacon butty...