• Cable down to 1.2925 as fire at nearby electrical substation closes Heathrow

• World's fifth busiest airport will be closed until midnight GMT

• 1.2925 is one-week low (1.2926 was Monday's low). 1.2911 was March 14 low

• The high after the BoE's relatively hawkish rate hold on Thursday was 1.2979

• UK government borrowed more than expected in Feb: UK fiscal update next week

• UK statistics office hit by new data problem as some price data paused

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(Robert Howard is a Reuters market analyst. The views expressed are his own)