It's alamo and national who are in bed together, I believe.

That rate does also suggest calling up to check availability. I've only used it once but it worked perfectly then.

A similar question was posed about a 1 way rental on christmas day and one of the car broker sites was showing availability at way less than the firms themselves.

Oh, is it worth looking at quotes from cab firms between lhr and stevenage too? I can remember being amazed at how much cheaper it was from Waltham Abbey to Heathrow vs Croydon to LHR, despite both being similar time/distance a decade ago!