The only officially recommended way of using a Hue bulb with the smartthings hub is by going through a hue bridge. (The topic title is a clickable link)
Meanwhile, can you return the hue bulb?
A Good replacement in either the UK or the US that does not require an additional bridge are the IKEA Tradfri lines. Very inexpensive, well engineered, work well with smartthings, and are surprisingly brighter than most of the more expensive competition.
The product descriptions will say that they need their gateway, but you can use the smartthings hub instead.
The IKEA smart bulbs and the plug-in pocket socket will work with smartthings. The handheld buttons and remotes will not be fully compatible.
There are several brands on the official “works with SmartThings” compatibility list, including the IKEA. For technical reasons, I would recommend the IKEA over the Sengled, just ask if you want to know those details, But since the IKEA are also brighter and less expensive, you may not care about the other reasons. 
