A trolley comprising: a trolley frame ; and a pair of castor wheel assemblies each mounted to the trolley frame proximal to a rear of the trolley frame, each of the pair of castor wheel assemblies including: a wheel bracket ; a swivel shaft mounted to the trolley frame and about which the wheel bracket swivels; and swivel limiting means operatively coupled to the wheel bracket or the swivel shaft and configured to: (i) limit swivelling of the wheel bracket in an inward direction relative to the trolley frame and substantially beyond an offset angle of between about 15° to 35°, (ii) otherwise enable swivelling of the wheel bracket without limitation, whereby one of the pair of castor wheel assemblies is limited in swivelling in the inward direction beyond the offset angle while the other of the pair of castor wheel assemblies is free to swivel limitation for guided steering of the trolley frame, said offset angle measured from the direction at which the castor wheel assembly would otherwise be oriented if it or the trolley were travelling straight ahead without turning. a trolley frame ; and a pair of castor wheel assemblies each mounted to the trolley frame proximal to a rear of the trolley frame, each of the pair of castor wheel assemblies including: a wheel bracket ; a swivel shaft mounted to the trolley frame and about which the wheel bracket swivels; and swivel limiting means operatively coupled to the wheel bracket or the swivel shaft and configured to: (i) limit swivelling of the wheel bracket in an inward direction relative to the trolley frame and substantially beyond an offset angle of between about 15° to 35°, (ii) otherwise enable swivelling of the wheel bracket without limitation, whereby one of the pair of castor wheel assemblies is limited in swivelling in the inward direction beyond the offset angle while the other of the pair of castor wheel assemblies is free to swivel limitation for guided steering of the trolley frame, said offset angle measured from the direction at which the castor wheel assembly would otherwise be oriented if it or the trolley were travelling straight ahead without turning. a wheel bracket ; a swivel shaft mounted to the trolley frame and about which the wheel bracket swivels; and swivel limiting means operatively coupled to the wheel bracket or the swivel shaft and configured to: (i) limit swivelling of the wheel bracket in an inward direction relative to the trolley frame and substantially beyond an offset angle of between about 15° to 35°, (ii) otherwise enable swivelling of the wheel bracket without limitation, (i) limit swivelling of the wheel bracket in an inward direction relative to the trolley frame and substantially beyond an offset angle of between about 15° to 35°, (ii) otherwise enable swivelling of the wheel bracket without limitation, whereby one of the pair of castor wheel assemblies is limited in swivelling in the inward direction beyond the offset angle while the other of the pair of castor wheel assemblies is free to swivel limitation for guided steering of the trolley frame, said offset angle measured from the direction at which the castor wheel assembly would otherwise be oriented if it or the trolley were travelling straight ahead without turning. <EOS>