£200,000 for a two man business? That kind of money would go a long way to developing your own product and sales database. £100,000 of stock? Why so much, or is capital equipment?
It way well be worth that, good luck to the sale. Any small businesses is a hard sell to someone else unless its a competitor or has something very definitely of value. When the main character retires then most of the added value is lost.
My base line is what added value is there that a student at £20k a year on the phone and car expenses couldn't achieve?