Andy posted a pic of taking delivery of a foam packaging machine this week, along with a pick in Feb of the production line on his Heighway Pinball Facebook page.
It looks like things are moving forward, no matter how slowly. Although it is slightly disconcerting the lack of updates on progress.

He looks at the UKPinball forum regularly ([email protected]), so maybe a direct question to him there may get further info.

I'm guessing, and it is just a guess, that he's not setting any further deadlines until the machines are made and ready to ship.

We'll just have to wait 'a bit' longer.