Contact your local council to find out who your local D of E co-ordinator is. Check out the D of E website for upcoming ventures, award authorities, advice, etc.
Going through one of these smaller companies, like Brathay, is simply paying for your award, bribery in a sense. I have never heard of them failing anyone, they're not keen on upsetting their customers, its a commercial organisation. Going through your local council is much cheaper and much more rewarding. I have heard of some of these companies even designing route plans, meal plans and the like, essential skills and aspects of the D of E expedition side. Also these commercial companies do run soft options in areas that aren't really up to the gold standard. Brathay offers expeds in the lake district which isn't really wild enough for a gold venture, its a soft option. Again, somewhere more extreme like Snowdonia is far more rewarding even if you walk through low cloud and force 9 storms for a couple of days at a time, up and down mountains.
Plus by going through the council you get a couple of weeks to a month break between expeditions which most of these commercial companies cut back on or simply don't offer. While after my gold practice and qualifying i could go further, i did really need the time to recover. In both ventures i lost half a stone in 5 days, i needed that bit of extra time to put the weight back on and recover, if you don't you get progressively weaker, run down and risk injury and/or not being able to complete it at all. And that was from consuming around 4000cals a day.