I've just come down from the gallery in the House of Lords after watching a fascinating (OK, I can be a bit nerdish on procedural issues - but this IS an important issue!) statement by the Leader of the House of Lords and subsequent debate on Commons privilege. Tweets as it happened were posted on WM_Alert.
Relevant background documents include
Money Bills and Commons Financial Privilege - Lord's Constitution Ctte Report
Clerk of Commons guidance - Waiving of Financial Privilege
I will post the Hansard report on the debate tomorrow