@DDee737 I'd suggest if the route was started, the most likely destination would be Gatwick.
That would be logical in terms of catchment, but the Gatwick charging scheme is designed to discourage smaller/regional operations in favour of maximising passenger throughput from larger aircraft, so the operating economics of a Gatwick route would be pretty adverse.
There's always SEN...
But as
Big Tudor says, the rail service is frequent and fast. IMHO there is no valid business case for a LPL-LON air service. (And if you want to argue for a service to Heathrow for connectivity, fair enough, but the opportunity cost of the LHR slots demolishes the business case there too.)