Cycle from London to Newhaven. What are the best maps?

[MollyT]

Hi I am cycling from London to Newhaven this summer. Never planned a route before so I am not sure which maps to use. I'm thinking of using a pre designed route going via limehouse, greenwich, catford, elmers end, fickleshole, noth downs ridge, outwood, weir wood reservoir, spithurst and lewes. Ive been looking at Ordanance SUrvey Landranger maps but not sure which numbers would cover these places!
Thanks for your help!