The LG NB3530A for £140 is a good deal. But are you sure optical won't an issue? Are you connecting your source(s) direct to the soundbar?
Reason I ask is it's almost certainly your LG--like most late model TVs-- purposely downgrades any surround audio signal input to 2.0 stereo via its optical digital audio out. That's why HDMI ARC (audio return channel) is at top of my soundbar wish list. Note it's not an issue when using the TV's internal tuner; for example using a smart TV's internal Netflix app will send a 5.1 surround sound signal to the soundbar over optical; but if you use a Roku box, Playstation, Xbox, etc. for your Netflix, the TV will convert the incoming 5.1 signal to 2.0 before passing it along through the digital audio optical out.
It's very frustrating because a powered soundbar enables you to simply use the TV as the "receiver" to switch inputs...but then this stereo down-mix defeats the purpose of the shiny new "surround sound" soundbar. However the anti-piracy features of HDMI encourages everyone to leave its signal unmolested; thus HDMI ARC is now the only practical way to get a true surround sound signal from multiple sources to your TV passed on to a soundbar.