Yep, that'll do it! And spares, as it does both ends of the cat:yesnod:!Do you mean these?
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=370292939534&ssPageName=STRK:MEWAX:IT
They also do the plated ones as well for about £8
this one;
http://cgi.ebay.co.uk/MG-MGF-Catalytic-Converter-CAT-Fitting-Kit-Gaskets-Bolt_W0QQitemZ370313433754QQcmdZViewItemQQptZUK_CarsParts_Vehicles_CarParts_SM?hash=item563866929a
or the one I bought;
http://cgi.ebay.co.uk/MG-MGF-Catalytic-Converter-CAT-Fitting-Kit-Stainless_W0QQitemZ370292939534QQcmdZViewItemQQptZUK_CarsParts_Vehicles_CarParts_SM?hash=item56372ddb0e