Taking to long as all other networks have had this for ages
I take it you mean by "all other networks" Vodaphone? As Vodaphone are the ONLY UK network with Nougat on the S6.
Virgin, O2, 3, EE and even UNBRANDED handsets do not have it yet.
EE are not the fastest and have never had a great track record with updates but Samsung have not even released this to unbranded customers yet. There is rumours of a serious flaw with the update hence it's delay in the UK.
You need to ask Samsung what is going on first... Once unbranded BTU is out THEN you have the right to hound EE for information. At the moment you should be venting to Samsung..