As it is to be based in the UK and operating under a waiver of permission, the airline leasing in the aircraft has to ensure "equivalent safety". This means operating to JAR-Ops compliant SOP/SEP and also to UK flight time limitations - much as per the First Choice/Air 2000 operation at Cardiff in 2000 where a Lotus A320 did their flying for the full season.
And from reading posts on another BB about this, someone from First Choice reckons they did a very good job too.