That I know from this system is:
Data:
- If Close London Market 17.00 GMT > Open London Market at 08.00 GMT &
Price below it so take Sell Gbp/Usd with TP:15 pips SL:6 pips
- If Close London Market 17.00 GMT < Open London Market at 08.00 GMT &
Price up it so take Buy Gbp/Usd with TP:15 PIPS SL:6 PIPS

We need to make a Line from Candle Chart in London market close to
Candle Chart in London Market open the day next at 07.45 GMT.
Because time frame from this system is 15M.

Hope this Help