During a debate on proposed changes the Assembly's electoral system, MPs were told that the Prime Minister did not tell the First Minister that any changes would be decided by Assembly members.
The difference of recollection emerged in this exchange between former Welsh Secretary Paul Murphy and Wales Office minister David Jones:
Mr Murphy responded by saying 'In that case, someone's telling untruths.'
Tense debate exposes irreconcilable differences between Welsh MPs on changes to the way Assembly members are elected in the future
MPs are to discuss changes in the Assembly's electoral system following the controversial cancellation of a previous debate.