Thank you all for your very good advice, Mace that is a great quote that I need to bear in mind now and in the future.
I'm sure as keen runners you'll empathise with me when I say this, but the thought of 2 days of no running at all is a little unnerving to me. I may do as Stutyr suggests and take it easy, but just go for a light jog on Saturday around my local park.
Thank you for the well wishes, I'm nervous which is strange as I'm only trying to beat myself!