DVP
I cannot help you with regards to the rear wheel.
Personally I take an aerosol of slime. Had I had a puncture in Scotland on some of the smaller roads, I would have just 'slimed' the tyre antil I could find a garage that could change the tyre. I don't believe in plugging as a permanent solution to a tyre so I would change it at the earliest opportunity.
Hi Robin
Why dont you believe in plugging tyres

Done correctly it is a acceptable permanent repair that will last the life of the tyre. In the past I've even ran with the offending objet still in just to get me home and had the tyre repaired. I never leave home with out a modern up to date puncture kit which are of the plug type and a miniature compressor.
Within the tyre fitting industry of which I deal with on a daily basis for my sins as an automotive manager / still active technician. This is industry practice.
With the cost of tyres I for one will get every inch of ware out of my tyres

Keeping within the guidelines set by VOSA and other governing bodies.
But never attempt a repair in the side wall

If this gets damaged the tyre is scrap

Chaos