SN1 = north to south - direct route
SN2 = north to south via Canal du Midi
SN3 = north to south via Le Havre - Paris - or Calais or St Valery
SN4 = south to north via Atlantic coast
SN5 = south to north via Azores
SN6 = south to north via Canal du Midi
SN7 = south to north via canals to Paris and Le Havre or Calais
Lorry option = a list of web sites of British and French haulage companies who specalise in boat transport.
The Cruising Association have a great little booklet for planning called 'Notes on the Inland Waterways'. Cost: £6.95 (CA Member) £13.95 (Non-Member) http://www.cruising.org.uk
You can buy the Canal charts listed above from Kelvin Hughes http://www.bookharbour.com/ at £15.50 each.