The instructions for the timer show the enlarger being earthed into the plug that connects to the timer. There is no earth wire so do i need to earth another way or is it ok without?
Most domestic table lamps do not have an earth wire, and for the most part, an enlarger is no different. Indeed, my Durst L1200 (B&W condenser head) does not have an earth, and I've never worried about it.
If you have any concerns, use an RCD breaker between the wall socket and the timer.