Actually you don't need to use any indicators to carry out this London Breakout strategy. However, if you can find market hour indicators on the internet or on the MetaTrader marketplace, it will be quite helpful.
Guys, be careful with Oil today, it's extremely low and some brokers shut it down temporary to avoid any trader make some activity with oil pair, from now on you should trade on forex or other pair, gold / silver can be a good choice also.
Yes, let's hope the best for the world. Regarding volatility is very high, just use your indicator or your strategies and believe on that. Don't against the trend, just follow the trend.