update
Thanks for all the advie and recommendations - very useful
been looking at various yourtube videos and discussed with the tech support guy at gpstraining this morning various options - great customer service
I jave now purchased the Twonav Roc with 1:25 OS mapping
Bag
out front bike mount
should be arriving tomorrow , by royal mail traced express delivery
I also get a subscription to tonline raining videos, and phone and email support , and if necessary they also use remote access - which i use when supporting my old customers on PC help