I don't know Electronic Empire, but if they only have a show room, then John Lewis will "likely" not match their prices. It is stated on JL website, that the competitor must have a high street store in order for them to match the price.
They do have a store apparently, and you can buy instore;
To purchase selected Sony products you will have to visit our showroom. All other products by other manufacturers can either be purchased online, or instore. We are based in Birmingham, West Midlands, you'll find easy access to our fully equipped showroom. We have a large selection of Flat Screen TV's, Blu Ray Players, Hi-Fi systems etc, on display so you can experience your product before you buy.
Premier A/V Centre
105-109 Soho Road
Both both Electronic Empire and Total Digital are trading names of Premier A/V so not sure how that works for price matches, as you say its only one store / showroom. Out of interest I did use Total Digital back in 2006 to purchase a surround sound system, which was all fine.
Edit: Also I noticed its in the same road as Electro Centre, where people are getting price matches on the F8000, they also have an odd differing trading name. Electro Centre Trading as Digital-Point