SVK makes a very good point in his post above.
When searching, type in as
little as you can possibly get away with... then pick from the list that then appears.
Keep in mind that with the SP 26xx series, there are several ways you can conduct a FIND - and it is important that you know how the thing works, because this will make a big difference to how quickly you get the result you want. The default system behaviour is to find 'near here' - meaning, to start looking from the present position of the GPSR, and to list the qualifying results (results that meet your criteria) in order, beginning with the closest result to 'near here' - your present position.
If you look carefully near the top of the page that appears when you initiate the find (meaning, the page where you start typing), you will find a drop-down menu that allows you to change 'near here' to some other possibilities, such as 'near destination', or 'show on map'. So, if you have a route active to, for example, Manchester, and you are presently in Paris, and you want to find a street in Manchester, be sure to select 'near destination', instead of accepting the default 'near here'. That will ensure your results are ordered such that they are closest to Manchester, not closest to Paris. If you know what village the street you are searching for is, point to the village on the map, then use that as your starting point for the search. Chances are, the first result returned will be the one you want.
Be aware that the FIND command is limited to finding places that are no more than 200 miles (straight line) away from the starting point you specify (near here, near destination, near other, etc.). That probably won't create problems in the UK, but I remember trying to find a user waypoint once when I was riding in the American midwest, and nothing came up at all on my list of user waypoints, even though I knew I had about 100 in memory. Problem was, I wasn't within 200 miles of any of them, so none were displayed, because I did the search using the default 'near here' filter, without even thinking about it.
Lastly -
Garmin doesn't make maps. Garmin licences maps from mapping companies, such as Navteq (formerly known as NavTech), Etak, and others. Most of the current products come from Navteq. If there is an error on a Garmin map product that comes from Navteq, that same error will be present on any other GPSR that uses Navteq data, for example, BMW OEM navigation, Ford OEM navigation, Panasonic and VDO aftermarket navigation, etc. Shit on the map supplier for cartographic problems, not on Garmin. Here's a direct link to allow you to take a dump when you find an error:
Navteq Contacts
PanEuropean