LCY-GRQ would surprise me. GRQ has a very limited catchment area despite an above-average growth in recent years. VLM very briefly operated GRQ-RTM-LCY flights in the past, attracting very poor loads.
BRE-LCY sounds like a good idea. It worked quite OK on OLT's Saab 2000 until Ryanair dumped capacity with the introduction of a STN service.
Problem for Sun Air growing at LCY is, imho, that they are always at risk of establishing a niche route successfully that after a while can sustain BACF Saab 2000 and later on the E70.