Hi Terry,
I've read lots of conflicting issues regarding 'pocket money' as you call it, and it seems to vary so much between IVA company's. In my IVA (which i started 15 months ago), i was told this would come under the Food/Housekeeping column, but i was told the maximum i could have for this was £150 per month. Now, i pay approx £120 per month on food, so i was basically left with £30 p/m for a social life! I was also 'advised' to put less for other things to make the IVA work in the creditors eyes, but unfortunately, this has led to my IVA failure as there was no real room for compromise, so i had to petition for my own bankruptcy yesterday.
Because of my experience, i would be very careful, and dont be put under pressure to put less than you actually pay out per month, and as Ang says, think of EVERYTHING, because i forgot things like prescriptions (i'm on 5 lots of tablets which adds up), and i stupidly forgot to include a store card at beginning of my IVA so i was also paying approx £20 on this (minimum payment) per month.
Anyway, hope things go well for you and good luck.