PREVIEW: Hatters in '˜exceptional' form but they're not invincible and there is a weakness

It's top versus second bottom at the Proact on Saturday when a side playing '˜exceptionally well' visit out of form Chesterfield.
Picture by Gareth Williams/AHPIX.com; Football; Sky Bet League Two; Luton Town v Chesterfield; 23/09/2017 KO 15.00; Kenilworth Road; copyright picture; Howard Roe/AHPIX.com; Chris O'Grady leaps with Scott CuthbertPicture by Gareth Williams/AHPIX.com; Football; Sky Bet League Two; Luton Town v Chesterfield; 23/09/2017 KO 15.00; Kenilworth Road; copyright picture; Howard Roe/AHPIX.com; Chris O'Grady leaps with Scott Cuthbert
Picture by Gareth Williams/AHPIX.com; Football; Sky Bet League Two; Luton Town v Chesterfield; 23/09/2017 KO 15.00; Kenilworth Road; copyright picture; Howard Roe/AHPIX.com; Chris O'Grady leaps with Scott Cuthbert

A ‘blip’ against Port Vale and an FA Cup exit at the hands of Newcastle United aside, Luton Town have been on a tear in League Two of late.