Cable falls to 1.2673 amid fear that EU/UK might not agree a Brexit deal
ITV's Peston tweeted that govt source told him "Chances of a deal are low"
1.2673 is the lowest level for GBP/USD since Tuesday's 21-week high of 1.28
Hope that a deal might be agreed fuelled the recent six cent surge to 1.28
See: nL5N26Z1LK. EUR/GBP up to 0.8705 vs Tuesday's 5-month low of 0.8625
Brexit talks go down to the wire ahead of EU summit Thursday nL5N271181
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