Unfortunately, there is no current special pricing for the UK, Canadian, or Australian markets that I was able to find; that pricing currently remains at £79 plus shipping. If you can bear to wait, I suspect that there will likely be a Black Friday deal in November.
My Heritage has a halloween sale on its DNA test, and is currently being offered at £59 / £59 plus shipping, or with shipping free if you buy two or more test kits. This sale ends on 1 November.
No special pricing was found for 23andMe, FamilyTreeDNA or Living DNA at this time; again, it may be that they offer sale pricing for Black Friday.