it seems like this system but why don't you add this as a plus or combine with your system

London Breakout System

1. get high & low of 9-13 GMT
2. draw line +5 pips above high 9-13 hr, and -5 pips below 9-13 hr
3. enter long if price go above +5 line , enter short if price go below -5 line
4. set SL @ low mark for buy order, vice versa
5. move SL to high mark when get 30+ (EU) or 40+ (GU), or close 70% of the whole order (partial close)
6. TP 80 (EU) or 120 (GU)
7. exit all @ 23 GMT (but 22 GMT on Friday)
8. if the price go against you & touch SL..take opposite trade @ 23 GMT
9. close all position @ london open

maybe give you more ideas ..

cheers