I truly hope it works out for you. It would be wonderful to be able to do what you love to do and get paid for it.
There are some cautions to consider in dealing with any employment agency. That field is a magnet for scum who take advantage of vulnerable people and provide very little help.
1) Cerco IT appears to be an employment agency that charges the prospective worker for its services. It offers temporary, full-time, and permanent opportunities. We have such agencies in the US, as well as agencies that charge fees only to the employer. There is a third option in which the agency gets paid by the worker after the worker is placed. And of course, there are blends of the three payment arrangements.
One could argue that a worker who is willing to pay an employment agency is more motivated to get a job than the worker who isn't willing to do that. Thus, he may make a better worker. He might also be a lousy employee who can't keep a job and is desperate. Unfortunately, once the agency has been paid, what is its motivation to get you a job? And remember, if you are a good employee, you won't be a repeat customer.
On the other hand, an employment agency that is paid by the employer has a strong motivation to place good employees, because of the prospect of repeat business.
I would want to know what Cerco's success rate was for placements before putting down any cash up front. What is Cerco's motivation to get YOU a job, once it has been paid? Now, if the reimbursement was based on a percentage of your salary, that might be a safer bet. Are its placements mostly part-time fill-ins or permanent positions. I suspect you want a permanent position. Many such agencies can be successful at filling part-time needs (i.e., "temps"), but don't do so well in placing permanent employees.
2) Have you checked out Cerco's reputation with any other employers or third parties? We have the Better Business Bureau (BBB) in the US. There may be a similar service in the UK to help check out a business.
3) Here's one blog that popped up on a Google search: **broken link removed**
Again, despite those concerns, I wish the very best for you.
John