Tesco sandwich labelling

I had the same issue in a Tescos about 4 years ago. I'd bought it for lunch and only realised it didn't have the weight on it as I was walking to the exit so I about turned and walked to customer services and demanded they weigh it for me.

I find it is a complete hit or miss with a lot of pre-packed food. Most of the time ASDA gives you both the amount of CHO per 100g and per pack but not always so I've been caught out before.