Forget Heathrow and battling out of London, much easier to head for Birmingham (arrive, then head down M6, then M1 southbound, then A43 Jctn 15A - 45 minute drive) or Luton (arrive, then head up M1 to Jctn 15A, then A43 towards Oxford - 45 min drive). Easy peasy compared to Heathrow and the A43 has been made into dual carriageway, so access is much improved - Silverstone is only about 10 miles down the A43 from the M1 Junction 15A. Not so clear on hotels, but there must be plenty of cheap ones in Northampton right by junction 15A
