The hex nut on the flange has rounded slightly (see last photo), so it will need a little perseverance to change the blade. A new nut is just a few quid though.
The item "Festool TS55 EBQ plunge rail saw 240V with systainer & 2 blades" is in sale since Tuesday, October 03, 2017. This item is in the category "Business, Office & Industrial\Power Tools\Saws\Saws\Circular Saws". The seller is "powertoolsje" and is located in London. This item can be shipped to United Kingdom, Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Australia, United States, Russian federation, Canada, Brazil, Japan, New Zealand, China, Israel, Hong Kong, Norway, Indonesia, Malaysia, Singapore, South Korea, Switzerland, Taiwan, Thailand.