Just tried it, they aren't being put into the category "pre owned" so nothing gets found. The search obviously only looks for categorised as pre owned. The words are however being put in the description and that search is looking through descriptions to try to match the words. I've already said some staff training needed earlier today. It really is.
You can persuade Google to search a specific website, something like:-
Hornby A4 site:hattons.co.uk. include everything after www. and between the final dot and the first /
Now I'm not too sure of the syntax but again on Google adding -pre -owned or -"pre owned" at one end or t'other should limit it to new ones, and if you were looking for a bit of history you would put in +Hornby +Dublo to exclude any modern or post Triang merger ones. You can miss out the bits about pre owned, even if someone found a box full in an old storeroom the zinc rot would have got them. I'll leave someone who gets annoyed by these problems to fathom out what the proper order is