It's still not clear to me if there is any additional baggage charge for carrying a TV. ba.com talks about a weight limit of 23kg, a standard size bag (35.5ins x 29.5ins x 16ins) and a non-standard sized bag (75ins x 29.5ins x 25.5ins) but does not say if non-standard incurs any extra charges.
Assuming that the baggage is under 23kg, why would the passenger be interested if BA considered a piece of baggage to be standard or non-standard if there is no additional charge?