Hi,
So I personally would be tempted to answer no, if there is nothing in your credit file to support this (defaults, settled or partial settled entries" and nothing in the public records section and you're no longer on the insolvency register (Google to search) you can check your credit file at noddle.co.uk or sign up to Equifax for a free 30 day trial, both will give you an instant credit report, remember to cancel your Equifax account after as it is only free for 30 days.
The flip side is that if someone ever had an axe to grind with you they could hold this over you and you could potentially be dismissed for being untruthful on a job application. It's a strange question they have asked, a bit of googling revealed this ofsted form
http://dera.ioe.ac.uk/20804/1/SWP2%20-% ... actice.pdf
Is this the same question E7 ?
"Have you ever been adjudged bankrupt, been subject to a debt relief order, been subject to the sequestration of your estate, made a composition or arrangement with creditors, or granted a trust deed for creditors?"
As it is a yes/no please provide more details I would be inclined to tick yes, and then in the defaults section write IVA made with creditors 8 years ago, discharged on xx/yay/zz No creditor arrangements since then or similar.
Though I would call the ofsted number like previous poster said (there is one at the top of the form) as "Jane Smith) [unless that's your name lol] and just ask them about the implications of this, they may say oh it's only an issue if there are current arrangements etc or in the last 6 years as per credit file statutory limits.
Ps I would also send the form direct to whoever is assessing if possible and not the employer so no one at your work has to know.
Good luck.