Nandita Saghalis of Insinger de Beaufort writes:

It would appear to me that there are three options: a buy-out supported by a venture capitalist; a placing of new ordinary shares to raise the firm’s funds in order to buy out your founder shareholders, coupled with admission to the Alternative Investment Market; or a trade sale.

Although you say your business is profitable you haven’t been paying dividends and have instead ploughed any profits back in to the business. You also say that you’ve little free cash. Unless the business is heavily capital intensive, which would be unlikely in catering, the implication is that the profitability of the business isn’t high. This would tend to rule out both options one and two, as the business would need to be producing sufficient profits to provide a venture capitalist with the required return and, likewise, to provide investors on an AIM flotation with a satisfactory dividend yield aligned to strong growth expectations.

In light of this, I think your most practical option would be to consider a trade sale to a company involved in the same sector. One which would be able to identify and realise economies of scale and thus help to increase the profitability of the business. While this option would involve you, as well as the other founder shareholders, disposing of your holding in the company, it should be possible to exchange your stake for new shares in the purchasing company, thus giving you an ongoing interest in the firm.