As far as I am aware I don't think Skandika make carpets and footprint groundsheets for their tents.
Any tarp bought from a DIY store will do the job of a footprint groundsheet - just ensure it is slightly smaller than the actual tent to prevent water pooling between the groundsheet and tent.
As for carpet, measure the size of your living area and then find a carpet that is made by another manufacturer that will fit.
I bought 4 extra large waterproof picnic rugs From halfords. On offer at £7 each. (usually £10) much cheaper than carpet. Got advice from this site. Much cheaper and you can lift them easily to clean them and pop in the washing machine when you get home.
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