The only way to tell is to read the current installed software file number in the ECU - for which you need the re-map software or dealer software to read it. All cars vary with tolerence levels and mileage - and the density of air that you feed the engine when you measure the BHP, so you can only take a comparison - a back to back figure on the day that you play - you might get 8hp - you might get 12hp - I had TDV8 and it was 259BHP on the rolling road and with the later map it was 269.5BHP - you could feel the improvement - from memory the original LR figures were around 260BHP, and now they will be around 274BHP I would guess - but that is only at max power - you also get a different curve with higher and lower steps in other places. You don't stop playing because you get old, You get old because you stop playing.

07 TDV6 been and gone. 08 TDV6 been and gone. 08.5 TDV8 in evaluation mode and now gone. BMW 535D M sport Been and gone, Now time for RRS No4 - TDV6 HSE in Stornaway with Ebony - 09 Model 6 months old.
RS Cosworth 4x4 Stage 2 Mint for summer
Audi TT
Astra VXR for the daughter.