It will improve if you remove the sand.

I recently did all this too. The general ground handling by TG at BKK is excellent, as you describe, between curbside and plane, for both departing and arriving pax. But I tend to agree with Swanhunter about the lounge itself. Yes, the service is great, but the CCR looks much grander, has somewhat better food (although room for improvement), better newspapers and magazines, and vastly better drink. TG may have oscietra and Dom Perignon on board, but you're certainly not getting anything like Grand Annee in the lounge.

I think you will find that sadly the £2300 fare was a special offer, and not normally available. I took an advantage of it too - it was a no-brainer since I had planned a trip to Thailand anyway.

Why do you care about this in the slightest when you can just book a limo yourself? I've really never understood the excitement about airlines providing limos. Many F pax will have their own driver, or a corporate one, anyway. My hotel in Bangkok provided a first-class limo service (as any of the decent hotels would, I expect) and they can even be booked very rapidly at BKK itself in the baggage claim area. So given that you're going to be paying for it anyway through an increased ticket price if the airline provides it, what's the advantage?