If I remember the Cranleigh 21 gives the option of finishing after 15 miles. Run it nice and easy and if all is going well I would take 15 mile finish option and then put another similar run (maybe up to 18 miles) in over the Easter weekend. Then if you have had no recurrence of your injury you will have enough miles under your belt to get round, albeit at a slower pace.
If the injury does reoccur and you cannot get the training miles in, the best thing will be to defer until next year (I had to do this a few years ago). It’s horrible at the time, especially on the day of the race. But it’s got to be better to do that, than run the risk of dropping out after a few miles. You will be able to run next year and this year’s training will help next year.
Good race except for a lot of people lining up too far up the field for their standard of running. I lined up by the 50 – 54 min marker due to lack of training (normal time is about 46m with a PB of 44m) and finished 50.49. First km took nearly seven minutes, second six due to slow runners. I was constantly passing people.
I am all for competitors of all ability’s taking part, but everyone should have the decency to line up by the appropriate time marker, especially as the event organisers have taken the trouble to provide them.