I've just had a chat with BM about parkrun in Preston Park (where the marathon starts) the day before the marathon, to confirm how we can fit in parkrun at 9am before the kids mini mile races and it all sounds OK, so if anyone will want to do a 5k warm up on April 5th we'll be there (I'm not sure if you should be running 5k the day before a marathon??) but if your parents / partners / children / friends are coming for the weekend and fancy a run or if you're a parkrunner and want to pop in to socialise we'd love to see you.
The route includes the marathon start line.
Brighton parkrun in Hove park will also be on if you want to go up the hill to run there.
There are various reasons for timing going wrong, can be that the timer person clicks too many/too few times or a runner funnel ducks or double crosses - this can make everyone after them move one place up or down the list so can easily make a big difference - if the person ahead/behind you was 30 secs different you will show as 30 secs faster/slower.
We try to spot errors in the results and straighten them out, but sometimes it isn't obvious or we can see there's an error but there's no way of knowing exactly where it happened, we may be able to see it was between P140 and P150 but we can only make a best guess where it was.
If someone mails with the time they got on their watch that can often give the clue to where the error was - given than it's extremely unlikely that anyone would lie about their time we accept what we are told as being true - it's usually obvious what's happened and we can correct a result.
Please note though that you're more likely to get a response if you point out politely that you think there's something wrong rather than going in all guns blazing - 99.9% of runners do ask nicely but it's spoiled by the odd one who goes off on a rant about how bad it all is - we are unfortunately only human
Reading your profile from hardly being able to walk 100 yards to now running 5k is a pretty big achievement, well done. There are plenty of people who can't run 100m never mind 5k, don't worry about people who can run it in 15 mins, we can't all be young and athletic!
You'll see with your parkrun registration you don't get a runner ID, it's an athlete ID, so that's further promotion!
Lots of parkruns have people who take 45 mins, but if your local one is faster than that as ours is then it's worth telling the run director so that they know to wait for you - we don't mind waiting but sometimes it's difficult to spot parkrunners amongst other people running in the park and it's easier if we know who to look out for.