A couple years. I have no idea how much or little they know the geology of their gas fields, and the UK has no experienced frack crews, rig suppliers, sand/chemicals suppliers, etc...
but with top-level support, big money will flow in, and they will learn soon enough
I would imagine that with Western companies pulling out of Ukraine and Russia, coming up with some good people won’t be too hard.
Unfortunately the suitable sites are either under heavily populated areas or beautiful countryside etc. Objections on these counts were what stalled previous pilots.