advice about letter of complaint to Thomson

We had a pretty poor experience with our Thomson holiday recently and am going to complain (and it will have to be via letter as their online form only takes 5000 characters and I have a LOT to say :mad: )
I was just wondering if anyone has any experience with this sort of thing and whether its even worth it

FYI, this is the letter I'm planning to send:

I recently returned from my honeymoon in Majorca and while overall the holiday was very pleasurable I was incredibly disappointed with our initial experiences.
On arrival at Palma we were shepherded onto a bus and given a letter. The letter explained that due to an iron man event on the island our transfer would not be able to take us to our hotel, but that we would be taken to a hotel in the centre of the city where we could wait until the roads reopened, no timescales were given and after some discussion we were told that a bus would collect us as soon as the road reopened.
On arrival at Club mac, our names and destinations were taken and we were informed that we wouldn't be allowed into the hotel complex itself, and we would instead be required to stand at the side of the road, while they sorted buses, again no further details were given. No water or seating was provided even though there were children and older people, and all of the bars nearby were full. In addition we were charged to use the toilet in a nearby hotel. It beggars belief that an ANNUAL (!) event would be allowed to cause so much disruption with zero forward planning on the part of Thomson. The woman who seemed to be in charge was adamant that the date for the event had only been released that week so you weren't able to pre-plan, but I find that very hard to believe, especially when there were competitors from all over the world taking part, and indeed a quick search online has allowed me to find out that the 2016 event will take place on the 24th September - I do hope you are able to put something in place before then. How hard can it be to get a local hotel to agree to allowing the extra guests to use their facilities for a few hours?
After waiting for an hour in the midday sun with my pregnant wife, who was getting increasingly upset by the fact that our honeymoon was being ruined, and our 2 year old son who had been awake since 5am and was becoming increasingly overtired, we still hadn't been given any information so I decided to consult the Thomson reps who were attempting to look busy and ignoring the crowd of disgruntled holidaymakers.
I finally managed to corner a rep and ask if there was any further information and whether it would be ok to go to a nearby shop to get some food and water as we were getting increasingly hungry. The person I asked (I believe her name was Claire) said to wait so she could consult the person in charge and she would let me know. I then watched as she walked a few hundred metres along the road, spoke to a blonde woman who appeared to be in charge, then promptly get on a bus and leave seemingly without a second thought.
I then managed to talk to the woman who was seemingly in charge who said that it would be fine for us to go wherever we wanted as the road to our hotel probably wouldn't be open before 15:30, but that we should come back a bit early in case that changed. Why this couldn't have been communicated to people earlier I don't know, as it would have saved a lot of hassle and distress. She did however add, that we would have to take our luggage with us as they were unwilling to take responsibility for them (or anything else it would seem!)
Having managed to get some lunch we returned to the roadside as there seemed to be some movement, and at around 14:30 we were informed that the road was now open and we would be on our way very soon. However, there was absolutely no organisation in how that would be carried out - it ended up being very much loudest complainers first. Having waited a further 30-45 minutes for a bus (and seeing at least three empty buses pass through without stopping!). We were finally told to get on a bus, we put all of our bags on and got on ourselves, only to be told that it was too full, so we would have to get everything off. We were told that there would be another bus in ten to fifteen minutes for us, however nothing came for at least 45 minutes. We finally got on a bus at about 16:30-17:00, and finally got to the hotel at about 17:30-18:00, on arrival we queued up and checked in without laying eyes on anyone from Thomson, even though we had been told that we should complain to the rep as soon as when we get to hotel.
To add insult to injury we later found out that people who arrived after us were transported directly from the airport to the hotel, which was why were left waiting around so long. Why we were taken away from the relative comfort of the airport to the side of the road I can only assume was to give us the illusion of action.
This was probably the worst holiday experience I have been through, and the worst organisation I have had to bear witness to.
I would expect at the very least water, shade and chairs to have been provided in a safe environment. I would also expect regular updates on how long we could expect to be waiting. Finally, I would have expected at least an apology, although throughout the whole day one was not forthcoming, just excuses and idle promises.
In future, I will think very hard before opting for a package holiday as having paid a premium for the peace of mind, the whole experience was so poorly managed that I can't believe it could have been any worse had we arrived with nothing booked and completely unawares of what to expect.

Yours Sincerely,