I choose bacon.
By wanting everyone to go vegetarian, Lord Stern of Brentford is trying to impose his will from the top levels of government down.
Remember, bacon is a line in the sand. Be it nanny statists or watermelons (Green on the outside, Red on the inside), it's them telling you how to live your life.
One more thought: He's concerned about methane gas (farts) from cows and pigs. It's obvious that he hasn't spent anytime in an enclosed area with someone on a bean and cabbage diet.
UPDATED: Linked by The Daily Gator.