I know they were charging VAT on groups as far back as 2003. It only applies, as matin pointed out, to tee times made through Travel/Tour companies and Hotels.
You can still organize a group of 8 golfers and apply and arrange for tee times VAT free.
The current greens fee makes me weep, though, since I remember my first greens fee at TOC was 10 shillings (about $1.25US), and the starters shack was really a shack. :-)