I think this is a European model. It's listed on the German LG site as you say
Google Translate and it might be a special for Argos and a select few stores to sell.
lg 42 lf 2000 günstig online kaufen im Preisvergleich bei Shopping.com. Flachbildfernseher | TV und Video | Elektronik | 5. August 2009 and here is a (what looks like) UK LG6000 series from last year listed as LF2510 Very odd.
Anyway, the specs on the LF2500 seem reasonable enough, bu it does seem it's an import for Argos and it seems like it's based on an older model. It might be an older model (LG3000/LG5000)- last years model in the UK - similar design.
Also, apart from the LF7700, the LF designation is generally no longer used as it is at least two years old, having been succeeded by LG last year and LH this year.
If you want an LG for the UK market, you might be better off with this year's LH2000 or LH3000 series. Bear in mind that the LH2000 is not full HD.