No Kezza that is not correct.
The 75% majority comes from the votes actually cast by creditors at the meeting, and not on the overall debt. It is also based upon the amount owed rather than the number of creditors.
For example, if you have four creditors all owed £8,000 and only one votes in favour of the arrangment, with the others not bothering to vote, you are deemed to have 100% majority!
It is important to remember that the majority is caluclated on those who attend and vote (usually by postal proxy vote) and not the overall debt. I have many examples of IVA cases in my portfolio which have been approved on the vote of only one creditor, which binds the rest of them automatically.
In your example the creditor with 75% of the vote would force the IVA to be rejected. Hope I have explained this correctly, as sometimes even IP's get muddled with the voting rules!
Regards, Melanie Giles, Insolvency Practitioner for over 20 years.
View my IVA blog at:
http://melaniegiles.blogs.iva.co.uk