The busiest times for Heathrow to Coventry are weekday rush hours, when the M4, A4 and M25 carry commuter traffic alongside airport and local journeys. If you are travelling before 8am or after 5pm on a weekday, it pays to leave a little earlier; evenings, weekends and school holidays tend to move more freely. We plan the timing either way, so the fixed fare and the pickup time both hold.
Nothing about the pickup is left to chance: the meeting point is agreed in advance, and on airport legs we track the flight so the timing matches your real arrival, not the timetable. Plan for the usual airport process around the journey itself — security and check-in outbound, passport control and baggage inbound — which is exactly what the free waiting allowance in your fare is there for.
Groups and luggage are worth mentioning at booking rather than working out on the day: a saloon suits up to four people and two large cases comfortably, while an estate, MPV or 8-seater gives more room for extra bags, buggies or sports kit. School holidays and the summer season tend to bring more group and family travel on this kind of journey, so booking a little further ahead helps guarantee the right-sized vehicle at a time that suits you.