Obtaining a UK visitor’s visa is not a straight-forward task and can be very tiring. It is also easier to apply from some countries than others and this is mostly to do with money and possibly reputation. It is obviously far harder for the average Thai to pay for a UK holiday than an average American. Arabs may be finding it more difficult too these days. So it can seem that the embassy staff have something against you. However, this is not true. They are acting under orders to protect the UK and so only doing their job. Do not take things personally. Some people also believe that the Thai government works with the embassy to prevent Thais leaving Thailand. This is not true either