While in the States, the Nokia Lumia 710 is the entry-level model for the series, it still has a faster processor, twice the RAM and can capture video with better resolution. The Nokia Lumia 610 can be bought for 150 GBP ($233 USD) as part of a pre-paid plan from Vodafone while $249.99 can get you the higher spec'd Nokia Lumia 710 for T-Mobile's pre-paid offering.
Meanwhile, Nokia has started a new advertising campaign for the Nokia Lumia 610 in the U.K. with the focus being on things that are different. The tag line is "Beautifully Different," which the Finnish manufacturer is using in the States for the more upscale Nokia Lumia 900.
source: YouTube via WPCentral