But then how about Horsham and/or East Grinstead to Shoreham-By Sea-Rail then farting around by road to the aerodreome then, allowing for delays, some 1hr check-in then 1hr, minus cabin crew and crapper, flight then public transport Pontoise to central Paris (check it out on
ratp.fr - Accueil if one dares to navigate the french language
compared to Horsham and/or East Grinstead by rail, with cabin crew and crapper, to central Paris.