Scheduling

On TNT, The Closer ran Mondays from 9.00-10.00pm EST.
On C4, The Closer’s running Tuesdays from 10.00-11.10pm BST.
On ABC, Lost starts its second series tomorrow, from 9.00-10.00pm EST.
On C4, Lost runs Wednesday from 10.00-11.05pm BST.
Why do US shows seem to run over an hour in the UK where, theoretically, we have less advertising than they do in America? The first episode of The Closer, might be a little longer because it’s the pilot, but even though Lost sometimes over-runs a minute in the US (for marketing purposes), there’s no excuse in the UK. And isn’t there also a little bit of speed-up due to NTSC v PAL?
Could it be that C4 are just packing their shows with too many ads?