Don't recall seeing ethnic origin being asked on car insuance applications.
however there has previously been controversy over the use of ethnic profiling by the police. The issue is that, although the statistics might show ethnicity as a "risk factor", there is no evidence that it is causal.
For example, young black men may be over-represented in crime statistics, but that doesn't mean that there being black causes them to be violent.
The main principle here is that you should not use a protected characteristic as a proxy for other, perhaps even unknown, characteristics that actually case the outcome that you wish to prevent or insure against.
This doesn to mean that you can't use non-protected characteristics. This case was also specifically about sex, but I suspect it may cause further debate about other protected characteristics in relation to insurance.
Interestingly age was considered here, but the opinion put before the court differentiated this issue on the basis that age is a characteristic that changes. People are likely to need insurance products at different times during their lives and therefore the effect on insurance pricing will be both positive and negative. As such there is no inherent detriment to any individual.
It really dissapoints me to see so many people on this board trot out the usual reactionary arguments against equality legislation.