[EGPWS]

It's probably also an easier place to 'practice' in advance of hitting the US.

Definitely easier, and the fear factor in reference to Dubya' plays a role also.

[unending thunder]

"It's probably also an easier place to 'practice' in advance of hitting the US."

Yes. Because we have had 30 yrs of NORAID funded IRA terrorism and so have got used to it.
To eat enough ricin to kill you will make you sick first. V large molecule 63K daltons difficult to absorb and associated crap due to impure distillation and extraction make you v sick. castor oil is well known and widely used emetic and opurgative.Very poor terror weapon, try cyanide, adulterated baby food, Tylenol, talcum powder in the post.

Celebrity terrorists cooks in a back street kitchen are going nowhere. Dodgy kebab shops and adulterated ecstasy pose greater threat to life in London.