No problem Oxa.
It looks like you can actually go down to 10p.
It seems there's a sliding scale, the lowest amounts that are accepted are...
1.02 and below - 80p
1.03 - 70p
1.04 - 20p
1.10 and above - 10p
You can't change a bet to below 10p at any odds.
I've tried to create a trigger to carry out the (now old) method of setting a low bet, but it seems you can't trigger to cancel a portion of a bet, is that right? If that's the case, I'll go down the compensatory back bet route for now.