The newer Panasonic LED/LCD are getting good press I saw 2013's at BB They look good .
I don't know what you have there tier one brands would be the usual suspects Sony,Panasonic ,Toshiba ,Samsung,Sharp Quatron,
I don't know if you have ROKU over there they usually work better than most embedded
Smart TV . I have 2 Roku's they work very well.
( I don't care for the LG IPS panels they usually have poor contrast ) but that could vary by model ofc. . I have one an LG 42 LN5300 it's in a spare room good view angle but abysmal contrast only 2000:1.
OTOH the Sony and Toshiba have good contrast 5000:1and 4500:1 respectively but not so good view angle . I think Panasonic uses IPS panels yet they seem to manage a very good picture .
Unfortunately Sony uses some LG IPS panels now
they also have AUO and Samsung panels I would want one of those if I were looking for another Sony mine has a Samsung SPVA panel.
ofc the Sammie plasma has the best contrast , view angle and picture (if the room is not overly bright but normal controlled daylight is fine )
I have a Sony Bravia 40R450A (I think it is a 453A over there ) in my bedroom that replaced an otherwise fine but too small 32" Toshiba LCD. and a 60"Samsung Plasma
(excellent picture).and the LG . I bought them all in Feb 2013 and Feb 2014 at end of mode year discounts.
New models come in mid March,April so that's the time to buy the outgoing models at a a discount. here in US at least. All the 2014 Sony's will be smart sets. Probably all but the least expensive sets of most other brands as will as well .
I would wait for the new 2014 Sony W7 and W8 sets and see how they are
http://www.sony.co.uk/hub/new-tvs
The 2013 Sony's are probably sold out OToH if you can find a 2013 W6 series that good good review . the 2014's should be better in the 40 and 42"sizes .
Or The current Panasonic LED are very good I'm sure the new ones will be also then
In the 2013 40 - 47 sizes " I would look at Sony,Panasonic Toshiba and Samsung in that order based on what I have seen with Panasonic and Sony W6 + series being the best of these based on what I have seen . I've seen all of these US 2013 sets including the Visio E series which were unremarkable but reasonably decent overall .
Are looking to buy an outgoing model or a 2014 model?
The newer sets with slim bezels may allow a larger size in your space perhaps a 46" or 47"
http://www.hdtvtest.co.uk/news/category/reviews