Andy
When I give settlement figures to my own clients, on a similar basis to the circumstances of your case, I work out how many more contributions are due to be paid, deduct the fees for completing the job and possible add a little extra to ensure that creditors will accept the offer. This, however, is merely a guideline, and you must formulate your own offer based upon what you think is reasonable and you can afford. Obviously the more you pay in the more chance you have of getting acceptance, but I would have thought that the lower figure would be a good starting point.
Regards, Melanie Giles, Insolvency Practitioner for over 20 years.
For further details contact me at
http://www.melaniegiles.com and view my IVA blog at:
http://melaniegiles.blogs.iva.co.uk