| Difficult Run to Bispham | 3,513.82 mi (5,654.95 km) |
| Difficult Run to Blackburn | 3,537.72 mi (5,693.41 km) |
| Difficult Run to Blackpool | 3,514.13 mi (5,655.45 km) |
| Difficult Run to Blairgowrie | 3,457.28 mi (5,563.95 km) |
| Difficult Run to Blandford Forum | 3,607.79 mi (5,806.18 km) |
| Difficult Run to Blaydon | 3,545.31 mi (5,705.62 km) |
| Difficult Run to Bletchley | 3,642.42 mi (5,861.91 km) |
| Difficult Run to Bloxwich | 3,578.39 mi (5,758.86 km) |
| Difficult Run to Blunsdon Saint Andrew | 3,607.43 mi (5,805.60 km) |
| Difficult Run to Blyth | 3,550.22 mi (5,713.53 km) |
| Difficult Run to Bo'ness | 3,455.97 mi (5,561.85 km) |
| Difficult Run to Bodmin | 3,508.93 mi (5,647.08 km) |
| Difficult Run to Bognor Regis | 3,671.08 mi (5,908.03 km) |
| Difficult Run to Bolsover | 3,594.80 mi (5,785.26 km) |
| Difficult Run to Bolton | 3,542.96 mi (5,701.84 km) |
