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@Wannabe
problem with osm tiles is that they are often 4kb, and it seems that SD cards have up to 32kb sectors, so the file can be up to 8 times bigger on the disk than in reality...they're trying to fix that, apparently. Anyway, this place has the maps you want, and this chap is the one I'd recommend -- routable bike paths = good thing. He reckons a 2GB card for the whole of UK.
I say get the biggest card the 605 will tolerate for extra map capacity.