That seems strange, that a L or P plater needs someone to ride with. I'd have never got the experience I got in the 20 months on my L and P plates in NZ if I'd had to ride with someone all the time. I did something like 24,000 km in the 20 months I was on my learner bike.
Mind, I was restricted to a 250 cc, the Aussie based LAMs bikes didn't come in until after I'd got my full license. And at first, while I was on my L plate, the maximum speed limit was 70 km/hr - though no-one stayed to that, on the open road that speed was dangerous.
As an over-25 I could have got my full license in a minimum of 9 months, normal was 6 months on your L plate then a year on P plates, you could halve your P plate time by doing a defensive driving course. Over-25s had to do 6 months L plate, then 6 months P plate but that too could be halved by doing a defensive driving course. I went for my full after about about a year, though I did a defensive driving course with my son while he was going for his car license. Didn't move up to my 800 cc Boulevard M50 until I'd been riding for 20 months and felt comfortable to do it.