Safe to insulate first metre of boiler outflow pipe?

Hi- I'm aware that the first metre or so (as recommended) of outflow pipe from a boiler should be copper, not plastic, but should I therefore not insulate the copper before it hits plastic piping, as surely I'd increase the retained heat hitting the plastic?
Also, should a plastic joint in the first metre (obviously not connected directly to boiler) be left uninsulated for similar melty reasons- or even there at all?

These are the sort of questions my unnoccupied mind dwells on.....

It'll be fine. However the more copper, the better.

Thanks for this. Thing is, I just contacted Speedfit (John Guest) and they told me no pipe OR fittings should be within a metre. So are there other makes which will be OK (can't see a name on the one the plumber put in)? Cheers.

I have three pieces of advice: MIs; MIs; and MIs. For example, I've seen 350mm (I had a feeling that was a Speedfit?) and 600mm limits quoted for boilers, and some even allow plastic pipe right to the boiler.

The restriction is not to stop hot water melting the pipe, because hot water shouldn't melt the correct type of plastic. It is a restriction on the pipe being melted by other hot parts in the boiler if something goes wrong. In that respect, you can lag all you want although you might want to consider whether the lagging is likely to go up in flames if part of the boiler gets ridiculously hot