PM's of Estonia and Finland say that David Cameron has so far failed to provide concrete proposals
The two European leaders, who both want the UK to remain in the EU, have told the BBC that the UK is yet to reveal any details about what it wants to achieve in a renegotiation with the EU.
But UK PM Cameron, who is in Iceland for a meeting of northern European leaders, said discussions were going well and has insisted all options were on the table, including leaving the EU.
Some British Eurosceptics look to Norway's position as a model for the UK if it were to leave the EU.Norway is outside the EU but is part of the European Economic Area, which allows it to trade in the single market
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Cameron wants to renegotiate the UK's relationship with the EU ahead of an in/out referendum on membership widely reported to be taking place by June next year
Given the bigger picture and the huge immigration problem I think Cameron will struggle to get the focus he needs right now
UK's Cameron not making himself very clear