There was a bit of weekend news about on GBP

Mike posted on: UK to trigger Article 50 by end-March 2017

And the US Justice Department want another pound of flesh from a bank, the UK Times with: US Justice Department expected to demand $10bn from RBS next year

Cable slid in early trade to open the week. Most charts won't reflect the fall except for leaving a 'gap' from US closing levels. That 'gap', though, is filling in to some extent as more centres come online(its still early though, just 7.20 odd if Tokto and 6.20 in Singapore and Hong Kong):

I reckon there might be a bit more of a fill move to come.