After having a look at the MI, when selecting Holiday mode you will have to set the number of days you will be away and then set the holiday set temp (it is 10deg as default as @Johnmdc suggests ).
You can set that to 5deg or 10deg or whatever you want the house temp to sit at, it really is the same as setting them to MAN and then setting the target temp you want the house to sit at. Personally I'd want it set to 5deg to minimise gas usage.
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