atticus wrote:If his claim is hopeless, he may find himself on the wrong end of an order to pay costs.
Costs which he possibly can't pay. In that case, even if you won, he wouldn't be able to pay your costs either, so you would be ultimately responsible for paying your solicitor. Bear that in mind.
An Order to pay costs doesn't actually mean that they will ever be paid by the party against whom the Order is raised. I think Atticus should have made that clear to you before he recommended you to run to a solicitor and rack up what could be substantial costs.