It looks like I've sorted it out. I deleted all the european maps, then added them back again, and now the UK map is allowing me to zoom all the way in and shows the full street detail at all zoom levels. Sweet! :)
Great!!
In hindsight I could probably have just deleted the United Kingdom because it took bloody hours to load every European map back onto it. :)
@Thuekr started
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It looks like I've sorted it out. I deleted all the european maps, then added them back again, and now the UK map is allowing me to zoom all the way in and shows the full street detail at all zoom levels. Sweet! :)