Have tickets to London (LHR) because that's all I could get. I actually want to go to Paris. If I buy BA tickets then I am protected in case of misconnect as its all Oneworld travel. I would prefer to take Eurostar though.

If I were to land late at LHR and miss my train what are my options to get to Paris. Could be from LHR or Central london or even another airport. Is there any way of getting to Paris for an affordable amount? I checked tomorrow's Eurostar and the cheapest is $300 per person.