Are you a director of the company? The lease company should pass the Hirer details to APCOA and they should then issue a Notice to Hirer (NtH) in the company name. If you are a director of the company and are authorised to respond on the company behalf, then no problem.
However, if you are an employee of the company and you are authorised by the company to the the car, then you will need a Letter of Authorisation (LoA) from the company for you too deal with it.
Whatever happens, as long as the NtH is responded to with the following (adjusted slightly if you are only authorised by the company rather than a director) it will be cancelled:
I am the Hirer. APCOA cannot hold a Hirer liable for any alleged contravention on land that is under statutory control. As a matter of fact and law, APCOA will be well aware that they cannot use the PoFA provisions because Stansted Airport is not 'relevant land'.
If Stansted Airport wanted to hold owners or keepers liable under Airport Bylaws, that would be within the landowner's gift and another matter entirely. However, not only is that not pleaded, it is also not legally possible because APCOA is not the Airport owner and your 'parking charge' is not and never attempts to be a penalty. It is created for APCOA’s own profit (as opposed to a bylaws penalty that goes to the public purse) and APCOA has relied on contract law allegations of breach against the driver only.
The Hirer cannot be presumed or inferred to have been the driver, nor pursued under some twisted interpretation of the law of agency. Your NtH can only hold the driver liable. APCOA have no hope at POPLA, so you are urged to save us both a complete waste of time and cancel the PCN.
Let me know if you are not a company director and I will give you a slightly edited version.