You mention "I have just purchased a philips dvd/HDD recorder which has an analogue tuner this will not pick up the digital signal"
I would be very surprised if the Philips dvd/hdd would have an analogue tuner (has you mention) as analogue is going to be phased out over the next few years, you also mention "this will not pick up the digital signal" I would have expected the dvd/hdd recorder to have been able to receive a digital TV signal (freeview) rather than the analogue signal that you mention it does?
What model Philips dvd/hdd recorder have you just purchased?
To your question "What do I need to do so I can one freeview channel whilst recording another"
You would need a freeview receiver that had two tuners in it. Below is a link to a search I done, you will find from the search various sites that sell the two tuner freeview boxes.