If this is the LGW flight, and it is on time, then 90 minutes will give you a comfortable connection, and you can shave a bit off that if you can use the e-gates. So all the time you add on represents the additional contingency for the LGW service being late. Since it's a brand new service we can't be sure how reliable it is. If it is one ticket (presumably not from the way the question is phrased) you would be allowed to book it with a 75 minutes MCT, which I think is ungenerous. So 2 hrs 10 minutes gives you more than 30 minutes contingency.

Note that Aurigny has some of the lowest hand luggage allowances in Europe, so assume on checking most of it into the hold.

The annoying thing is that but for the biometrics / CTA at LGW this could be an easy connection at LGW, Aurigny's departures are about 100 metres from the BA gates on the same wing that the YYZ service will use.