I’ve heard that they do not. If the sales target for the entire store is met, I believe they get an additional 400-600 pounds gross, not sure if monthly. It is definitely not like the U.S.
SAs might care about making sales to be promoted, but I heard in two stores in London from SAs that they do not make individual commission, and one SA told me what I just wrote above.
In Paris it seems to be very similar, they get a slight increase when sales targets are met, and I believe there are 3-4 a year. It is store based also.
Net it is not much, hence they do not consider they are making commissions.