If there's one thing I've learnt from working at the Disclosure & Barring service, it's that you should never accept a caution. If you signed an official caution then it will almost certainly show up on your DBS record. If it's on your record, know that it's just a minor offence and would only be visible if an organisation requested an enhanced check (minor offences are only visible on an enhanced disclosure). The type of caution you received is unlikely to affect you (though it's ultimately down to the individual employers discretion.) There are some cautions that definitely can affect you though, especially ones that are sexual or violent in nature (employers will take these seriously and the DBS may even consider barring you if the circumstances around the caution show you may be a risk to children or vulnerable adults.)