In article ,
Chris Hogg wrote:
On Tue, 27 Dec 2016 15:24:06 +0000 (GMT), charles
wrote:

I have a question. How long did the
changeover take? I don't wamt to be without gas in the winter = nor
without electricity for any length of time. I need them both for the
boiler to operate.

SSE say the supplies to each meter will be off for about half an hour,
and the total installation will take about two hours.
http://tinyurl.com/jrnk2ko and scroll down to 'Here's how the
installation process works'.

two meters at half an hour each only adds up to 1 hour

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from KT24 in Surrey, England