I would think the depression history would be a good reason NOT to do this, Jo.
I hate to say this, but in a situation like this - you are really NOT their patient. Yes, maybe in a legal sense, but not really in a moral sense - because they are somewhat more interested in getting those eggs than they are in making sure you are the lowest-poissible-risk donor candidate. They probably don't get that many donors (one of the reasons private sources in the States will pay big bucks for the right donors) and so they view your relative contraindications as less important than their other patient's desire to get pregnant. Makes me a little bit queasy, all of it. After all, it's not like you're donating a kidney to save a life. These people do have adoption as an option. Although the risks to you are not huge, there are risks - and I think the professionals tend to downplay them a bit, because, after all, this is their business.