I used to cater Mon, AMM & BY ex LGW & I had a pretty good insight into the service levels demanded by each airline. Air 2bob were very big on service - at the time I left the business, I had seen big plans for that carrier to up it's service to it's customers - they were serious. Brit was a reasonable standard - never much liked the crews though & Monarch or McMonalds as they are sometimes known were pretty cheap & cheerful, although most pax we met were fairly happy with the service rendered. However, it is true to suggest that all the charters I dealt with were hugely focused on squeezing all the dineros they possibly could out of your wallet - it's a tough world out there & you gotta make a living somehow.
We also did transatlantic carriers - American Airlines first class - now there's a service you would like...