Long and painful conversation with Nokia in summary, I have a TA1100 single SIM model. There is no Dual SIM model officially available in UK.
I will be returning it for a refund as it's not the product listed.
WORD OF CAUTION FOR OTHER BUYERS: Argos are currently listing (@time of edit) the Dual SIM version but they only stock the single SIM .They will probably update their listing in the near future. ADDITIONAL: Argos were happy to refund
* They track their model variants (at least in customer service land) using the model numbers "TA1nnnn"
Below are the details I've gleaned so far.
** TA1100 - EAN: 6438409024077 - SKU: 11CTLL01A13 - Single SIM - Purchased UK
** TA1095 - EAN: 6438409023438 - SKU: 11CTLL01A07 - Dual SIM suitable for the UK
** TA1096 - Single SIM
** TA1097
** TA1085 - Dual SIM
Nokia customer service do not recognise the terms EAN or SKU.
This EAN is listed on a number of EU web stores, but I cannot find the Nokia model number - EAN: 6438409023438, SKU: 11CTLL01A07
Thanks for your help
@TobbeTabb