Can anyone advise me of where after market headlight gards and bonnett protectors can be obtained. Also a cargo mat.

Ummmm... why don't you just buy genuine accessories and save yourself the hassle of tracking down aftermarket sh!t, plus the genuine accessories fall into your new car warranty. Hell, if you can afford to buy a new Prado, surely you can afford the genuine accessories?!?

Fair enough but some people dont realise what they need a tthe time of ordering the vehicle.
Later it will be an add-on purchases, and aftermarket stuff might suffice (mats for example).

In terms of afford -- you wanted to say the opposite -- after you bought a brand new prado you cannot afford anything in this life, including accessories, and of course genuine ones