If you are an Irish citizen who wishes to work in the UK with the ederly, young children, or the vulnerable, you may be required to obtain clearance from the Irish government. This is not a function of the Irish Embassy, and all such requests should be directed at the Garda Central Vetting Unit in Ireland.
More information is available from the Garda website here: http://www.garda.ie/FAQ/Default.aspx?FAQCategory=36