Marshalls of Sutton-on-Trent have a few...
The 339 from Tuxford to North Muskham has to reverse at Cromwell on the southbound journey, as the village is off the A1, and the slip road onto the southbound A1 is on the opposite side of the road to the village.
The 856 from Bottesford to Lowdham via Bingham has two reverses en route - the first at Shelton, and the second at the end of Abbey Road in Bingham.
The 857 from Shelton/Bottesford to Newark has a reverse at Staunton in the Vale.
Travel Wright’s 335 from Retford to Ollerton (formerly 35) had THREE reverses en route sometimes! The first was at Elkesley, Headland Avenue; the second at Elkesley, High Street (which was fun, as it was on a blind bend); and the third at Bothamsall Church - although that one is on a request section of the route, so it all depends on demand. I’m not sure if they still serve the High Street part anymore though.
And Centrebus have a few too on routes around Leicestershire and Rutland.
The 23 between Melton Mowbray and Bottesford has a reverse at Stathern; whilst the 25 between Melton and Stathern has a reverse at Eaton.
Certain journeys on the RF1 from Oakham to Corby have a reverse at the small village of Wing, whilst the RF2 between Oakham and Melton Mowbray has two reverses - one at Greetham, and a second at the Kendrew Barracks in Cottesmore. These are usually done by turning the bus in the road, as both have enough space to do a 180° turn - but the turning area at Greetham is regularly full of parked vehicles, so a reverse is sometimes needed there.
The 55 from Grantham to Sewstern/Saxby has two reverses en route, the first being at Knipton (although if you have a small Enviro 200, a 180° turn can be done!), and the second in the small village of Stonesby.