Have you tried the 03001231350 ext 252 number?
Although you may well be on hold for a good while nowadays - I was on hold for exactly 45 minutes the other day (it didn't use to be the case) it is much, much better than the actual medical line number.
You will be in the queue, unlike the other number where you go through the whole process and find out no one is available to take your call.
I have found that if you sit through the options message several times, including the goodbye message eventually you get put in to a queue, you may have a 10 minute wait but your call does get answered. Hope this helps