The 29-year-old has joined the League Two leaders on a reported two-and-a-half-year deal on deadline day.
Barnett has previous experience in the league, having represented Oxford United on loan earlier this campaign.
The forward was able to notch eight goals in 40 games after he was brought in as Peterborough's first £1m player in 2012.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Birmingham CityBirmingham | 19 | 14 | 3 | 2 | 35 | 16 | 19 | 45 |
| 2 | Wycombe WanderersWycombe | 20 | 13 | 5 | 2 | 43 | 22 | 21 | 44 |
| 3 | Wrexham | 21 | 12 | 6 | 3 | 31 | 14 | 17 | 42 |
| 4 | Huddersfield TownHuddersfield | 20 | 12 | 3 | 5 | 34 | 18 | 16 | 39 |
| 5 | Stockport CountyStockport | 21 | 10 | 6 | 5 | 34 | 22 | 12 | 36 |
| 6 | Lincoln CityLincoln | 21 | 8 | 7 | 6 | 28 | 25 | 3 | 31 |
| 7 | Reading | 20 | 9 | 4 | 7 | 30 | 30 | 0 | 31 |
| 8 | Bolton WanderersBolton | 19 | 9 | 4 | 6 | 28 | 29 | -1 | 31 |
| 9 | Barnsley | 21 | 8 | 6 | 7 | 29 | 30 | -1 | 30 |
| 10 | Mansfield TownMansfield | 19 | 8 | 4 | 7 | 23 | 22 | 1 | 28 |
| 11 | Charlton AthleticCharlton | 20 | 7 | 6 | 7 | 23 | 19 | 4 | 27 |
| 12 | Blackpool | 20 | 7 | 6 | 7 | 29 | 31 | -2 | 27 |
| 13 | Exeter CityExeter | 20 | 8 | 3 | 9 | 19 | 22 | -3 | 27 |
| 14 | Stevenage | 19 | 7 | 5 | 7 | 15 | 17 | -2 | 26 |
| 15 | Leyton Orient | 20 | 7 | 4 | 9 | 23 | 20 | 3 | 25 |
| 16 | Peterborough UnitedPeterborough | 20 | 7 | 3 | 10 | 38 | 37 | 1 | 24 |
| 17 | Wigan AthleticWigan | 20 | 6 | 6 | 8 | 19 | 18 | 1 | 24 |
| 18 | Rotherham UnitedRotherham | 19 | 6 | 5 | 8 | 19 | 21 | -2 | 23 |
| 19 | Bristol Rovers | 20 | 6 | 4 | 10 | 18 | 29 | -11 | 22 |
| 20 | Northampton TownNorthampton | 21 | 5 | 6 | 10 | 21 | 34 | -13 | 21 |
| 21 | Crawley TownCrawley | 20 | 5 | 4 | 11 | 20 | 33 | -13 | 19 |
| 22 | Cambridge UnitedCambridge | 20 | 4 | 5 | 11 | 20 | 35 | -15 | 17 |
| 23 | Burton Albion | 20 | 2 | 6 | 12 | 17 | 32 | -15 | 12 |
| 24 | Shrewsbury TownShrewsbury | 20 | 3 | 3 | 14 | 21 | 41 | -20 | 12 |
| > League One Full Table | |||||||||
