Yesterday I paid off the balance on my service plan and it seems I've saved £80 by paying early. Not sure why but I'm not arguing. Handy too as today I signed up for the All in One deal and they have changed the booking I had for my forthcoming MoT test to being covered by the new plan. So I've saved £135 which is 4.5 monthly payments of the new plan, great!
Also tried the soundaktor in Sport, not as bad as I thought but it'll go back on Eco next drive.