The last suggestion sounds the most useful to me. :-) Thank god it never gets that cold here that you would need one of those muffs. There are not very aero.
Cover hands with grease from chain.Extend handlebars so that they reach inside your coat.Wrap hands with used inner tubes.Encase hands in actual bra.
Thirty quid!Get a pair of those tiny 'magic gloves' from a pound shop and wear them under your normal gloves. Works for me.
I thought that was why people rode around with phones against their face...?
Luckily I was unemployed for most of the winter, so I can testify that the last solution works well. I have also attempted to warm myself at the exhaust grill of buses-- unfortunately it doesn't seem to work that well. Or at least, I don't remember any occasions when it worked well.