Butt hooks are allowed in NEFTA HFT shoots and as far as I am aware there is no limit to the depth of the stock.
We also have 15mm kills as close as 12 yards.
We also have the standing / kneeling class and no forced prone shots.
Most of the rules differences are to open it up to as wide a field of shooters as possible - as a regional event we need to attract as many shooters as possible.
I would still think its great practice for the UKAHFT events - the course at Emley on Sunday was as tricky as any I have ever shot.