If he's ordering it from the UK it may be more difficult. I've not seen anywhere over here that sells it (I don't think you can get the spark-lite over here either, I've looked). I'd like one of his packs but I've not seen one avalable here, and you can only order it online from the states (that I've found) and that costs a bit in postage. If someone knows a place that has reasonable postage to the UK let me know.

The main things you do get in Dougs kit that you don't have in your kit are:
The Spark-Lite (whcih I have yet to see in the UK)
The Mini-Fox 40 whistle. I have a standard Fox 40 which has been trimmed down a bit. It is worth it the Fox 40 is a damm good whistle (its also the one all FA refs use) and the mini one looks ideal for a survival kit.
Also the signal mirror is a good one.

The rest of it you already have equivalents to, or are easilly obtainable, but the above items are certainly of the best quality and not commonly avalable seperately (at least in the UK).