My area of expertise this lads, ABI rate it as a 15 for sure, 100%, although this is intended as a guide to consumers only, not a hard and fast rule which insurers are obliged to stick to.
If you ask your own insurer they will tell you the group they allocate it as. For example we rate it as a 63/99 where a broker support 99 groups, 15 where they support 20 group etc. others will be different and that's before we get into whether we choose to impose special terms or apply a load based on another factor (we apply an additional load to 4x4's for example)
I guess the main point to make is that any argument that you might have following being quoted more for a G40 than another car which is supposedly the 'same group' will likely result in disappointment!
