GBP/USD Forex technical analysis

What have you lot done now? I pop out for 10 minutes to pick the kids up and come back to find cable scuppered.

We're down to the area of strong technical support I highlighted earlier.

GBP/USD H4 chart

I've taken a small-ish long down here as I like the tech but I'm a bit worried about what's driving the move. The yen pairs are playing a big part and I'm not sure why that is. This fall looks fairly strong so I'm going to 50/50 this trade between a pure tech trade and a longer term position build. I've put a partial stop below the 50 fib at 1.5251.