No earth Terminal bar in consumer distribution box?

Recently I had an electrician hook up a new consumer distribution box. I now wish to run an extra fuse and wire off of this box and upon opening the distribution box, find that there is no earth terminal bar with earth wires attached. The only earth wire that comes into the distribution box is one that goes to the lightning surge arrestor; no way in hiding this. Perhaps he felt that he did not have the space to run the 5 or so earth wires into the box? As is, he has joined these earth wires in the cavity behind the distribution box and I can no longer see or get to where he has joined these earth wires. The one earth wire to the Lightning surge arrestor, is probably only some 5 inches in length, to where this would join up to the other earth wires, connected in the cavity, behind the distribution box.

Can this 'one' earth wire attached to the lightning surge arrestor be utilized to join to a 'earth terminal bar', upon which other new attached fuses can join their earth wires to, or will this have a negative affect on the lightning surge arrestor?