The P clips don't fit the new leads well Richard. When I took the old leads off I found they were slightly chaffed from the cowl as it gets very close there. I would suggest you cable tie them a bit more outboard to give better clearance. Not driven with them yet either but it seems to start a bit quicker than before from cold.
Thanks Ian but they must have changed the build spec because the P clips I removed were perfect fit for the new 8.5mm cables. I was able to re-use them just adding small washers under the pop rivet heads. No signs of chaffing either so fitted new leads with same run as originals.