The obvious choice for the website owner would be one of the existing GA flight planning sites, for example Skybook GA. They could add it as a string to their bow, and charge a premium for the service - and extra £49.99 per year or £2.50 per transaction or something.....Easy peasy. Get a delivery receipt emailed to you with filing time etc....
You can email the info to some police forces - though I emailed ours (on the "ports" email address published on their website) to ask if I could email this information, and never got a response. That was half a year ago!
