Visit this website to download a 86,000 Square mile Landscape of British Geography. 

**DISCLAIMER** This is a Big File. You need at least 4GB of free space to download. 

**DISCLAIMER #2** I did not create this map/file. I just found it browsing things. Your welcome. 

Link: http://www.ordnancesurvey.co.uk/innovate/developers/minecraft-map-britain.html