Japanese stock market went down 3% but no impact on the dollar which strengthened against the Euro and £.
Don't think there is any reason why it would affect the £/$.
Doesn't look like it would impact it. The best guide is to look at the forward rates at www.ft.com, which tend to indicate a rise in $ to £ in the summer, by only a few cents and then retruning to the current level. However,. these are only what are expected, and they can be very dramatically wrong!