I did do. I read a lot of forum posted first to try and work it out myself. Settings are:-
max_execution_time = 9000
memory_limit = 500M
The script seems to run for about 5 - 10 mins. I then have to "Resume last session" for it continue. This general does work, but it stops when it gets to approx 5000 links. Its currently stuck on "Continue the interrupted session (2007-10-13 16:04:16, URLs added: 4783, estimated URLs left: 17363)".