By Jon Robinson The owner of London Southend Airport is facing the demand to repay a near-£200m loan early after being hit by new allegations. Widnes-headquartered aviation and renewables group Esken, which is currently undergoing a winding-down process, has confirmed fresh claims that it breached a convertible loan agreement for the airport (LSA). The group, which has already sold all its divisions and is currently in the process of divesting the airport as well, said it would be “value destructive” for all parties if it was forced to repay the money early. The convertible loan has a maturity…