I spoke to a GP who said basically that the official guideline is to not travel, but realistically there are so many people walking around not knowing they are infectious, and therefore not taking any precautions it would be unnecessary to cancel the holiday in our circumstances. assuming I stick to the precautions I outlined to him then he thinks the risk of infecting anyone is very very small and does not justify cancelling the holiday assuming the DC are well in themselves.
another medically trained friend said that she would also go and mentioned that a week in the pool would do wonders to stop the itching for them.
so we will be going but I would say that:
DC1 is fully scabbed. DC2 &3 are not but have a comparatively mild case, they are not unwell in themselves and are playing and eating as normal. I would not consider them 'ill' in that sense. they will be fully scabbed by the time we are due to travel back.
we will keep them away from people - including keeping them in the car in the tunnel, parking at the far end of service station car parks for leg stretches and using a portable toilet for the younger 2 DC.
we will travel with enough food and drink so that we don't have to go into service station concourses.
we are staying in a private house with no visitors. we will take our own bedding for the DC and I will personally give the house a thorough clean before we leave. we will take our own toys for the DC.
we know where the nearest hospital is and can converse in the language should treatment be necessary.
to those that said 'just cancel and rebook' - this is just not an option, extended family are joining us, its a big deal for us and if we cancel that will be it, no holiday this year at all. not saying our right for a holiday trumps health concerns but it isn't true to say ' just cancel and rebook' is an option for us.
Thank you for everyone's thoughts and opinions.