MIT License

Copyright (c) Toby Thurston 2017

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

This software makes use of a data table derived from the OSTN15 data set
published by the Ordnance Survey of Great Britain.  The following
information is reproduced from the OS user guide for the OSTN15 data
set:

> Data copyright and other intellectual property rights
> 
> The copyright and database rights in OSTN15 data is owned by Ordnance
> Survey Limited.  
>
> Trademarks
>
> Ordnance Survey, the OS logos and OSGB36 are registered trademarks and
> OSTN15 is a trademark of Ordnance Survey, Britain’s mapping agency.
