What is the only UK monopoly property which contains all the letters of the word monopoly in it?

There is no property in Monopoly that contains all of the letters of the Word Monopoly. However, the Community Chest block does contain all of the letters, but you have to piece them together from the whole block.

______________________________________________________

NO IT DOESNT C-O-M-M-U-N-I-T-Y C-H-E-S-T

no "P" or "Second O" or "L"

It should be noted that different countries have different properties on the board. So it is possible that a particular version could have such a property.