Politicians have expressed their outrage after the speaker's chaplain inserted a prayer for ‘Gaza' in the morning parliamentary religious service, yesterday morning.

Last night, MPs and Lords voiced their protests - with one accusing him the chaplain of ‘lacking balance’ and another of ‘sucking up to left-wing Labour MPs’ following his ‘unprecedented’ intervention during daily prayers.

The chaplain's controversial reference came in the Commons' daily private session of Christian prayers before the start of proceedings yesterday, held in private with Press and public excluded.

But MPs told the Daily Mail that Reverend Mark Birch took them by surprise after telling an almost two-thirds full Commons Chamber ‘we pray for the United Kingdom and Gaza’ shortly before the start of PMQs.

Sources say the Chaplain has now privately apologised to some of the MPs who were in attendance.