Wikipedia defines Purdah as:
"... is the common term used to describe the pre-election period, used in politics to describe the time between an announced election and the final election result. The time period offers a prior opportunity for government departments to develop guidance and policy due to any impact resulting from the election. It also prevents central and local government departments from making announcements about any new or controversial government initiatives (such as modernisation initiatives, administrative and legislative changes) which could be seen to be advantageous to any candidates or parties in the forthcoming election, or which may commit any incoming new administration to policies which it wouldn't support."
Although it has no basis in law legislation does provide a code of recommended practice for local authority publicity which is outlined above. Clearly this code does not extend to national government's as both Leighton Andrews and Leslie Griffiths have made announcements during the Purdah period which could be perceived as promoting the candidature of local Labour candidates.
Mr Andrews announced that he would be visiting the Remploy factory in Wrecsam on the 18th April 2012, so I wouldn't be surprised to hear a positive statement in support of Remploy on the day.
Secondly, Lesley Griffiths tweeted today,
"Delighted to see
@calonfm is to receive £18,000 Welsh Gov boost."
Surely Welsh Government ministers should have a code similar to what Westminster Ministers have during the Westminster Purdah