I would just like to say

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Cable be laid. Slabs be put back. Only one cracked but yer dunt notice when it was out back. Edgar was unset. Eye got wet un cold but am feddup of puttin it oft. It had ter be done. Am cold so am avvin a hot baff. Chuck dinner ter nite. Emptied me watta buts. Got pic's of the ice. Me red fing int corner is ont 115.
 
Fanks. Why does the ratio drop fer winter? Does it need more sment ter hold ter geffer when cold?
The theory is, cement gives off heat when it hydrates, so a bit more in winter helps stop it freezing. Mortar which freezes before it has set and got some strength goes "dead" and useless. In practice, brickies have always chucked a bit more cement in the mix in winter 'cos it works. The important thing is to protect from freezing temperatures.
 
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