Mix the 200's/400's with the short rep day, so you're not doing 2 quality days back to back, no need for that.
Get rid of the circuit training. You want endurance go run more quality mileage. Look at my post about weights today.
Also, remember to be specific with your %intensity week to week. Don't do too much fast stuff too early, and back off every 2-3 weeks and do more threshold stuff or race.
This is modified/Americanized from a Renato post earlier this year. It's based off of a 4:27 miler.
I: SPEED1(Maximum Velocity)- alactic sprint training/max velocity training.
II: SPEED2(>115%)- All out. 100-120m moving up to 200-300m (occasionally). Total volume: no more than 1000m.
II:SPEED3 (~115-110%): 14.25-15.17/28.5-30.34/42.75-45.51/57-60.6. Lactate tolerance for last 25% of race: 120-200m moving up to 300-400m (occasionally). Total volume: no more than 1800m.
III: HIGH SPEED ENDURANCE (105%)- 15.89/31.785/47.67/ 63.57/79.45/95.34. Lactate tolerance for mid race period: 300-400m*moving to 400-600m (occasionally). Total volume: 2-3k (depending on interval length).
*(occasionally when feeling good)
IV: SPECIFIC SPEED ENDURANCE (100%)- 16.68/33.75/50/ 66.75. Lactate tolerance/race tempo: 400m moving to 600m/possibly 800m. Total Volume: No more than 3k-4800m.
V: SPECIFIC AEROBIC POWER (95-92%)- 17.56-18.13 /35.12-36.26/ 70.24-72.52/ 1:45.36-1:48.78/2:20.48-2:25/2:55.2-3:01. VO2MAX development, High end Aerobic power. 600-1k (depending on speed). Total Volume: 5k.
VI: GENERAL AEROBIC POWER (90%)- 18.54/37/55.62/74.16/3:05/3:42/4:56. Supports VO2max development, Raises anerobic threshold at high veocities. Also provides PSYHCHOLOGICAL preparation for specific work/racing. 1k-1600. Total Volume: 10k.
VII: SUPPORTING AEROBIC POWER (85%)- 19.62/39.24/78.48/2:36.96/3:16.2/5:13.92/6:32.4/9:48. “Critical Velocity”. Supports VO2MAX work+ Lactate tolerance work. 1-3k. Total Volume: 5-10k, possibly 15k.
VIII: AEROBIC ENDURANCE/LACTATE THRESHOLD (80-82%)- 80%- 20.85/41.7/83.4/2:46/3:28/5:33.6/11:07.2/16:40.8/22:14.4/ 27:48/ 33:21.6.
82%-20.35/40.7/81.4/3:23/5:25.6/6:47/10:10.75/10:51.6/16:17/16:55. Lactate Threshold and increasing Aerobic endurance/ability of mitochondria to metabolize lactate through the lactic acid shuttle. 80%: 3-5 miles, possibly 10k. 82%: 3k-3200m (maybe repeats).