| 13:50 - 400 METRES - Men - Heats - Heat 1 | START LIST |
| First 2 of each heat (Q) plus the 4 fastest times (q) qualified to Semi-Final | |
| |
| Personal Best | Season Best | ||||||
| 1 | | Ellis GREATREX | BIRCHFLD(GBR) | 47.76 | | ||
| 2 | | Nicholas ATWELL | THAMES V(GBR) | 48.11 | 48.81 | | |
| 3 | | Ben SNAITH | NEWHAM EB(GBR) | 48.48 | 48.48 | | |
| 4 | | Sam HAZEL | SHAFT'BURY(GBR) | 48.14 | 48.14 | | |
| 5 | | Owen SMITH | CARDIFF(GBR) | 47.03 | 47.30 | | |
| 6 | | Elliott POWELL | LEICESTER(GBR) | 48.00 | 48.00 | | |
| 13:57 - 400 METRES - Men - Heats - Heat 2 | START LIST |
| First 2 of each heat (Q) plus the 4 fastest times (q) qualified to Semi-Final | |
| |
| Personal Best | Season Best | ||||||
| 1 | | Chris MCALISTER | THAMES V(GBR) | 48.14 | 48.88 | | |
| 2 | | Jacob PAUL | WSE HOUNS(GBR) | 48.39 | | ||
| 3 | | Efe OKORO | BIRCHFLD(GBR) | 47.70 | 48.38 | | |
| 4 | | Alastair CHALMERS | GUERNE(GBR) | 48.19 | 48.19 | | |
| 5 | | Joe BRIER | SWANSEA(GBR) | 47.95 | 47.95 | | |
| 6 | | Thomas SOMERS | NEWHAM EB(GBR) | 47.20 | 47.78 | | |
| 14:04 - 400 METRES - Men - Heats - Heat 3 | START LIST |
| First 2 of each heat (Q) plus the 4 fastest times (q) qualified to Semi-Final | |
| |
| Personal Best | Season Best | ||||||
| 1 | | Dan PUTNAM | BLACKHEATH(GBR) | 47.80 | 48.93 | | |
| 2 | | Matthew PAGAN | SHAFT'BURY(GBR) | 49.20 | 49.20 | | |
| 3 | | Jack HOCKING | WORCESTER(GBR) | 48.30 | 48.30 | | |
| 4 | | Lewis BROWN | SHEFF (GBR) | 48.24 | 48.31 | | |
| 5 | | Ben CLARIDGE | ABINGDON(GBR) | 47.93 | 47.93 | | |
| 6 | | James GLADMAN | BIRCHFLD(GBR) | 47.87 | 47.87 | | |
| 14:11 - 400 METRES - Men - Heats - Heat 4 | START LIST |
| First 2 of each heat (Q) plus the 4 fastest times (q) qualified to Semi-Final | |
| |
| Personal Best | Season Best | ||||||
| 2 | | Adam WALKER-KHAN | SHEFF (GBR) | 48.03 | 48.54 | | |
| 3 | | Krishawn AIKEN | SHAFT'BURY(GBR) | 48.45 | 48.45 | | |
| 4 | | Jarryd DUNN | BIRCHFLD(GBR) | 46.67 | 48.05 | | |
| 5 | | Cameron CHALMERS | GUERNE(GBR) | 46.91 | 47.20 | | |
| 6 | | Alex HAYDOCK-WILSON | WSE HOUNS(GBR) | 48.01 | 48.01 | | |