Strangely the episodes they are showing the UK don't seem to match the descriptions of any of the ones on the Discovery US website.

Todays episode is:

Jet Assisted Chevy.
Two feature film special effects experts test the bizarre claims of urban legends and misconceptions, using ingenious experiments to assess the facts.

Which doesn't really match with any of the episodes described here:

http://dsc.discovery.com/fansites/mythbusters/episode/episode.html

And next week is this:

Biscuit Bazooka.
Two feature film special effects experts test the bizarre claims of urban legends and misconceptions, using ingenious experiments to assess the facts.

(don't you know love Discovery UK's infomative programme descriptions, though I suppose we are lucky they are actually giving some sort of epsiode title, they often don't bother with that either)