If you sell any let us know !
Are these those?
http://adventuresportphotography.com/Norwich_Half_Maratho_g78.html
The legal point can only be more around the name and trademark of the event, and use of that name. They have made a financial deal with the organisers (you'd be shocked at the amounts full marathons get paid by the large corporate photography companies - you couldn't make half that per competitor) to have the official rights, not with you.
In my mind that means they have paid for the right to be :
1. officially promoted by the race organisers
2. runner contact information and emails for their spam and sales stuff (official sponsor partner of the race - you signed up for that)
3. Access all areas to take photos (ie. finish line)
4. possibly to be the exclusive photographers promoted by the organisers
Are you getting any of that ? nope.
Your position is one of taking photos in a public place of the public. This is legal in this country.
You have two choices:
1. withdraw from the market place
2. stay and sell the photos
The promoters have fewer choices
1. get upset that they can't control the world or make money from you (especially if they could have made more money from you - but I seriously doub't it!)
The official photographers can't do much at all, as the agreement contract is between them and the race organisers - not you.
If the official photographers have an exclusivity clause with the race organisers, then you might want to mitigate your position slightly by emphasising on your website that they are "unofficial" photos and add a weblink to the official ones. Also I wouldn't go using the full sponsored race title - there may be trademarks involved.
Also because of the exclusivity agreement - you will find that they (should) have to refuse any profit share you might want to offer ?. Always a nice touch and makes you appear generous to a T, - if they have morals and abide by the contract themselves - so always a good acid test of who you are dealing with.
Finally - if you are going to do unofficial jobs, make sure your exposure and image quality is professional and your prices reasonably aligned and competitive - otherwise you will reduce your local markets price expectations in when you have official jobs - killing your business in the long run. The event organisers don't want a load of dark rubbish sillouettes put online "showing off" their great event do they ?!- especially if you want the official job at some point in the future.
oh - and get your images online faster
and indexed before the official ones. It's a competition, and therefore a race to be had.
I don't know of any organiser succesfully getting anything beneficial out of these threats, you might like to ask for a copy of the agreement/contract with the official photographers so they can show you which bit of the agreement you have broken ?... ;-)
And I've never known an official photography company to take someone elses images after an event. The budget has been set and the job done, you're too late.
Let us know what the outcome is. Have a nice chat with the other company - again do remember to ask for a copy of the contract !!!
Oh - and as for the bit about the Forestry Commission - you can. They encourage it. You need permission to stage an event on their land (and pay a fee), but you can take plenty of pictures without asking. Again the promoters of the event might want a look in if they don't already have an *
exclusive official photographer*, so it's always best to have a chat first. Then you know what you're letting yourself in for, and frankly not doing so is rude and not very business minded, or helping the event photography community at large.
Also - don't dump on your fellow event photographers - we all have to make a living somehow ! Get involved early and often is the best motto.