Unsecured loans allow you to borrow money for your business without putting up any business assets as security. They are often a quick and easy way to get a cash injection into your business, although they are typically more expensive and shorter term than secured loans.
A personal guarantee will always be required, pledged by the controlling directors, which means that you will be personally responsible for paying back the loan in the event the business is unable to for any reason. You will need to demonstrate that you have sufficient collateral behind you in the event of default (e.g. home owner). Unsecured business loans are typically available from £25K up to £250K.