Whoops handler only on local (Homestead) development

Yes, environment variables have been created for that!

http://laravel.com/docs/5.0/configuration#environment-configuration

Thanks, I do have my .env already set up correctly on my local development machine and the APP_ENV and APP_LOCAL variables are not present on my forge server yet the full "Whoops" error pages are being shown.

How would I use environment variables to set which error pages I use?

You need to set APP_LOCAL to production.

You can view this video on Laracast explaining how to set environment variable on Forge.
https://laracasts.com/series/server-management-with-forge/episodes/5

That isn't it I don't think: Here is a screenshot of the environment variables page from my Forge installation.

I added the variable like you suggested (as you can see when you select "Application Uses Laravel 5.0+" the "Environment" field is removed).

Would I need to edit anything in my bootstrap/app.php file to utilise the environment variables?

With Laravel 5 you only have one environment, so you don't need to set it on forge.

But you need to change the value of APP_LOCAL.

Unfortunately that doesn't help. Maybe it is the way the Whoops page is being called.

Did you also turn off debug?

Yes I did

When I cat my .env file from SSHing into Forge, this is a part of it (only excluding the APP_KEY and database details).

APP_ENV=production
APP_DEBUG=false
APP_LOCAL=production

How did you add Whoops? With GrahamCambell's package?

I'm using this package https://github.com/filp/whoops

I've added this to my bootstrap/app.php file

$app->singleton(
    'Illuminate\Contracts\Debug\ExceptionHandler',
        'App\Exceptions\WhoopsHandler',
    'App\Exceptions\Handler'

);

You didn't check for debug mode.

Try to use this package: https://github.com/GrahamCampbell/Laravel-Exceptions