Replacing a ceiling rose with a light that only has L/N/E connections

Do not wrap tape around the choc-block as shown, use a choc-box

e.g.

http://www.tlc-direct.co.uk/Products/CHOCBOX.html

http://www.screwfix.com/prods/46538/Electrical/Cable-Accessories/Cable-Connectors/Chocbox


Alternatively a junction box such as this is ideal:


http://www.tlc-direct.co.uk/Products/ASJ501.html