Is anyone on GiffGaff in the UK? (LTE not working)

I just purchased a brand new Xperia Z3 (D6603) and cannot get my LTE to work! I am on Giff Gaff

I followed instructions on how to setup the APN on this page:
http://ift.tt/1Vy3LeE

Has anyone on GiffGaff in the UK managed to get their 4G to work?

If so, could you please post your APN settings here?

Thanks!

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