Asset Bundle example not loading on iOS device

I am trying to get the example AssetLoader scene working on a device but am getting am download.error "Forbidden".

It is the bundle "cube-bundle", asset name "MyCube".

It runs fine in simulation mode but once built and the bundles uploaded to my server I cannot get the scene to work.

I have reverted to just the example scene from my original project to establish a simple scene works on device before trying anything more complicated.

I am using FileZilla to upload the asset bundle and manifest files, using all possibilities (Auto, ASCII and Binary) but no luck.

In the LoadAssets.cs script in Initialize() function I am referencing the SetSourceAssetBundleURL as "http://www.mywebsite.co.uk/AssetBundles/" I have also tried "http://www.mywebsite.co.uk/AssetBundles"

Initially I uploaded the complete created folder from Build AssetBundles command but had the error "not found" but the url returned had two iOS folders in it so I made another iOs sub folder and now get this forbidden error.

I am using Unity version 5.3.3f1

Is there a recommended ftp client I should use to upload the asset bundle and manifest?

I am using the AssetBundleManager asset and example AssetBundleManager project and AssetLoader scene provided from the Asset Store.

Any help would be greatly appreciated as I have spent a lot of time searching forums and trying alternatives to go the basic asset bundle scene to work.