Tony's advice is good (as always!), but playing devil's advocate I would add the following:1. Experian and most central checking services have databases that are out of date or full of junk. They may have info about your qualifications and how many loans you've applied for in the last year, but I doubt they'll be able to confirm that you're earning £48,500 when in fact you told the HR department you're earning £60,000. The only people who can do this is you, your employer or the tax man right? However, I may be wrong - I'd love to know more about these services and how often they are used/how accurate they are.2. Sleepless nights are a good reason for not lying. A VERY good reason actually. But getting a higher starting salary if you can does make a big difference - imagine having an extra £10,000 per year for the rest of your career.... you can effectively fastforward your career and get the equivalent of several years worth of promotions just by getting a higher starting salary. Plus many employers who hire on the basis of what you "could" earn in the future seem not to honour their promises these days (think about the paltry pay rises and bonuses that have been dished out during recent years by many of the large firms).Tony's key point however is VERY good advice... you really don't want to be losing sleep over a lie that could catch up on you at any time during your career with the new company.