I checked the pants last night and each side is pull type adjusters, the velcro goes all round to the rear so I would have thought the small adjustment you need is going to be fine.
As for price, sorry its £40.00 posted as its going to cost £8 odd to send so I want to have £30 actually in my hand, or can be collected in essex.
These items are both still available and can be collected from the Formula 5 event in Colchester on 25/05/14 - Just let me know in advance and i can bring along.