Possible French travel arrangements.

 A quick check of domestic timetables for Sun 25th May reveals that it will be nigh impossible  to get to London much before mid day so I shall probably stop over Saturday night with my daughter in Tower Hamlets. I could be in Paris for say 3pm local time and there are regular trains either to Orleans (about 1 hour journey) or Nantes (about 2 1/4 hours) from one terminus or another. In conclusion, I can be in Orleans or Nantes by Sunday night, 25th May ready for a start on the Monday. Similarly, I can get back from either town in a day. Maldwyn, it will depend on your final choice of ferry as to which way we go.