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After digging through my tools, it's a shimano:
http://www.rakuten.co.uk/shop/taylorwheels/product/16161909/?sku=16161909&sclid=a_pla_uk&$$ja=cgid:20170741716%7Ctsid:71873%7Ccid:271496316%7Clid:41477300408%7Cnw:g%7Ccrid:62637775116%7Crnd:16609606290572991152%7Cdvc:m%7Cadp:1o3%7Cbku:1That's the 21, I've got the TL-SR. 22 which is the 1/8th version... There's also a 23 which from a bit of googling has added magnets to hold the chain in place when using the lockring tool.
Velosolo?