The 15-mile Sheffield Round is where city meets countryside to gorgeous effect, says Fiona Reynolds.
It’s the leaves that are so joyful at this time of year. Unfurling, bursting open, thrusting skywards or gently unfolding — every shade and shape is there, from the palest lime through fresh shades of moss to deep, lustrous pine. And flowers, too: the pale wood anemone has been joined by the bright yellow celandine and the first bluebells are tentatively opening. As…