We are a group of four people and think the best way to get from Portland, England to Heathrow 5 is a taxi service, shuttle, or car with driver. Is this our best option and what is a good car company to use? Thanks.
Previous posters recommended Blackberry car service. I reached out to them for a ride next week. I received a reply that they're servicing their computer system, and are unable to book anything after July 17 until the update is completed, so that may not be helpful to you.
I just booked with Express Airport Transfer -- https://www.expressairporttransport.co.uk/.