Oops, I thought it was a Vision, I was helping someone on another forum and got mixed up. A 29 could be a Compact A, easiheat, Maxim or Excel, versions of the same boiler all sent with a Tyco lead and the stat comes ready to plug straight in, or should.
That's a basic stat but it can be converted to OpenTherm. Video on YouTube search convert Vokera RF stat to OpenTherm. Wolseley sell the stat and accessory for around £35. Part number 127709.