The law on workplace pensions has changed!
All employers are legally required to automatically enrol certain staff into a pension scheme and make contributions. You will also have to tell your staff about the scheme you put them in and allow other staff to join if they request to do so.
The Pensions Regulator is the UK regulator of work-based pension schemes and their web site is very useful indeed. The web site address is: www.thepensionsregulator.gov.uk