Well, given it is basically Elite spec with towbar, I would have to say yes...
well, in fairness to you young sir, ive now done the maths (cos im a sad barsteward) and you're actually very close to the original Vauxhall test weight.
looking at the owners manual your specific car needs to weigh 1825kg to be at the correct test weight. with a base kerb weight of 1625 (ive already minused the weight they add on for an average driver of 68kg), your towbar at 24kg, half a tank of fuel (as per your video) roughly 25kg, your body weight of around 76kg (youre 12st right from what I remember you saying once? may have made that up if so apologies lol) and the spare I assumed you were carrying at 20kg that works out at 1770kg. so youre only 55kg off which equates to 3 tenths roughly which is nowt in your case as you're well around the correct 0-60 time for your car. assuming youre happy that you timed it right. if not, like me, youll need to invest in some sort of accelerometer as tigger or opti mentioned.
So. the fact that i'm quite a bit off, and others like your good self are bang on, hopefully you understand why I'm interested to find out why.... hence the 34 page thread