As Above from Very.com seems a good price not sure how it compares to the LG, but affordable alternative.
http://www.very.co.uk/samsung-50in-3d-full-hd-1080p-freeview-hd-plasma-tv-ps50c7000ykxxu/720203967.prd?aff=buyat&affsrc="d_data&cm_mmc=buyat-_-ELECTRICAL_AND_SEASONAL-_-PY0091T-_-50in%203D%20Full%20HD%201080P%20Freeview%20HD%20Plasma%20TV%20PS50C7000YKXXU&prdToken=/p/prod6043393-sku10012052&browseToken=/q/py009"
http://www.very.co.uk/samsung-50in-3d-full-hd-1080p-freeview-hd-plasma-tv-ps50c7000ykxxu/720203967.prd?aff=buyat&affsrc="d_data&cm_mmc=buyat-_-ELECTRICAL_AND_SEASONAL-_-PY0091T-_-50in%203D%20Full%20HD%201080P%20Freeview%20HD%20Plasma%20TV%20PS50C7000YKXXU&prdToken=/p/prod6043393-sku10012052&browseToken=/q/py009"