£20K rather depends on how large the area is. Mine is 150 sq m. I'm paying
£4,300 for the slabs
£450 for the slurry,
£400 for 8 calender days digger hire
£800 for Type1 (likely another £300-400)
I'm paying a day rate for the labour - so far £3,600 with likely another £3K to come