I spent about 3 hours in Stanfords, Bristol, as they have the entire Discovery series of maps in stock, but at £8.50 each might be a tad pricey (I reckon I need about 20!), could get the whole country on Rangemaster for less, but I really prefer old school mapping, and in an emergency you can wipe yer arse with an old map, but with an ipad.........
Routes - there are two different types of minor road that I am intending to use, 4m width or less than 4m width, and they are abundant, some are unpaved but they will still be smooth - I will be on road biased tyres.