This place used to serve some of the best food of anywhere we have been in Europe. The quality iwas always the same repeatable high standard. Service is still very good and the staff are very helpful and pleasant but this time 5 months later...things have changed. The Prewn Cracker dip complimentary starter has gone, the quality of our Sweet and Sour Chicken was very average as the chicken was tough and chewy, also both of our egg fried rice dishes were very lumpy and not the very nice rice we have been used to after many visits. Prices have also gone up quite considerably. We will return when we come back to Tenerife in November and see if things have improved as we eat here a lot when we are in Tenerife for 5 weeks, but if the quality is like this time, we might start going to another Thai Restaurant, hopefully that will not be the case as this was the first time we have ever been disappointed in many visits over many years eating in Yim Siam, albeit Thai Chef was having an Off Day.More