4. Employees

Staff costs and the average monthly number of employees analysed by activity, including executive directors, are shown below:

ContinuingDiscontinuedTotal
Group2013
£000
2012
£000
2013
£000
2012
£000
2013
£000
2012
£000
Employee benefit costs:
Wages and salaries20,74021,55911,54215,18332,28236,742
Social security costs2,8512,5887419903,5923,578
Other pension costs (note 21)2,3182,22141332,3592,254
Share-based payments (note 27)1,3231,092108771,4311,169
27,23227,46012,43216,28339,66443,743
Group2013
Number
2012
Number*
Production444428
Sales and marketing1616
Administration and support services6566
Engineering and product development10094
Continuing operations625604
Discontinued operations505559
1,1301,163

* Restated (see note 1).