Depending on who is asking, Dominic has two standard answers. Either:

I work as a customer service advisor

(He works on the shop floor at B and Q and sometimes shows people where items are to be found)

Or, he says:

I am an artist; a writer.

To some extent the selected response depends on where he is and what he is wearing. For example, he is far more likely to be a writer if wearing his battered Lenin cap and drinking in an unfamiliar pub.