Update - June 29th
Frank has asked to make an additional stop on the route between Arras and the first stop on the current plan. His great-uncle is buried in the Serre Road Cemetery No2 and by some luck it is on the D919 route that we will be already on. There are three cemeteries in a very short distance and Serre Road 2 looks enormous. In fact 7127 burials. http://www.cwgc.org/find-a-cemetery/cemetery/67200/SERRE%20ROAD%20CEMETERY%20No.2 I have added it to my master copy on my TomTom and can send it out to anyone that wants an update.