ZOE BROUGHTON

If you plan to film inside a company, it makes sense to spend several days working or becoming familiar before taking in your equipment.

There's a huge range of undercover equipment available which is getting smaller all the time as it's going digital and can be concealed in all sorts of places.

Try not to break the law by removing any property from the company - instead you can film sensitive documents, write information on scraps of paper or even on yourself for later use.

Don't get caught up in telling huge webs of lies. The closer you are to the truth, the easier it is to speak convincingly to your workmates or to your boss.

With undercover work, it is not advisable to tell anyone except those who absolutely need to know what you are doing.

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