edited - As the company has closed (poss gone out of business) Matt you are limited in what you can do anyway.
With a Ltd you can never claim against an individual only the company, dependant on how Turbofit close the company depends on your options, its more than likely they will go into insolvency and the only route is a small claims court, the law has just changed which benefits claimants over the government though, now the insolvency company get in there first and take there cut for their fees and then the rest is split between claimants finally any outstanding VAT is paid. or this is as understand it from Kate.
As an explaination of what Pete has said there is nothing to stop a.n.other from turbofit setting up another company doing the same thing, just the current directors of Turbofit can not i.e. Sam