Nick - I've had a look at thomascookairlines.com and thomascook.co.uk but can't see anything showing flights from Norwich to Palma on a Monday operated by Evelop; the only thing I can see is flights on a Tuesday operated by Thomas Cook Airlines. Admittedly, these two websites are only showing details for summer 2016.
Would it be possible to know a little more info about what Evelop are doing for Thomas Cook, in Norwich and also across the UK ?