Thanks for the replies we currently charge £10 in advance £12 on the day, we only have a winners male and female prizes but do give a medal to all. My view is we don't need chip timing as per your comments but said I would canvas replies.
I just thought I'd update. I completed the Marathon in 4:33 so overall very pleased but very similar experience to daeve, In hindsight I didn't get enough long runs in only one 20 mile before the event. I got to 18 miles in 3 hours then it all went to pot 1:33 for the next 8 no injuries just dead legs, Great event Barcelona, Rome next!!