I suppose vegetable oil in a bottle will be some kind of vegetable oil- but how can you be sure it is rapeseed if not labelled? Happy to pay a bit more and know for sure.
But in all over products, 'vegetable oil' is always the dreaded palm oil- responsible (well its producers) for massive destruction of the rain forest from Madagascar to Sout America- all over vegetable oils are clarly labelled as sunflower, rapeseed, olive, etc, etc. Very glad that in Switzerland this is now illegal, and palm oil cannot hide under the generic 'vegetable oil' and has to be clearly labelled as such so people can choose to not buy (boycott!)