UlsterTR7

My search for the word 'key' informed me that I was searching for a banned term (the following search items are not allowed: key), so all I could do was search for the word 'spare' which had no results at all. (No-one on this forum ever talk about a spare tyre?) Why is the word 'key' banned, and how do I search for topics on the term 'spare key' otherwise? I need one, but can't find out how to get one, if I can't search for it...