Hmmmm....
Well, I didn't get it using my way. Actually it's a whole string of Buy it Now items over the next 24 hours with very few bidders revealing themselves.
I have set up another Bid Group. The starting bids are £29-90 but what I don't understand now is that my (lying-in-wait) 2nd Snipe of £33-50 is flagged up as Bid Below Minimum by AS and the bid increment in this range is £1.
Any clues?
...in fact 2 minutes later all my snipes have been flagged up as Bid Below Min. by AS - same figures as above.