If you’re bringing a bike, verify cycle policies on trains; some lines restrict non-folding bikes

https://www.scribd.com/document/1074904087/Private-Hire-and-Ride-Hailing-to-Heathrow-What-to-Know-Before-You-Book-216958

If you’re bringing a bike, verify cycle policies on trains; some lines restrict non-folding bikes, so consider airport buses with luggage racks instead.