Worcester Bosch on Twitter: "@stevekbridge Hi Steve that model is a Greenstar 28 jiunior, with an MT10 time clock fitted, if you would like to send us a DM with your address
How to Operate Worcester Bosch MT10 mechanical timer Ian Puddick - YouTube
How to set boiler timer controls | Heating hub | E.ON
Worcester GREENSTAR HEATSLAVE II EXTERNAL 25/32, Greenstar Heatslave II External (01.09.2014-21.07.2016) User manual : Free Download, Borrow, and Streaming : Internet Archive