There are 2 chartered aircraft operating out of EMA on Monarch flights presently, one is a Air Italy B733 and a Small Planet B733. They also operated out of BHX. Its an unusual tactic these days, we're more familiar with Canadian aircraft coming to the UK for the Summer etc.
Why do Monarch do it, summer only contracts, make you're money then retreat for the winter.
At least these airlines comply with easa standards which should offer a crumb of comfort. If you've sub chartered the Omega B707's then you're game for a laugh...