Thanks @BosKonay for the very quick response, so just to clarify when I look at my account (logged in) it shows recent order (for H-Vans) order number IRM-xxxx(numbers not shown here for obvious reasons), if I now go to the shop and order Hunslets, they will show in my cart and then I place the order, does my "recent orders" now show IRM-xxxx (the H vans) and IRM-yyyy (the Hunslets) or do the Hunslets get added to the IRM-xxxx (ie an order with H-vans and Hunslets).
I suppose what I am asking (in a roundabout way) is if I wish to order items from two different lines tonight then if I place the items from one line in the cart and submit it, then go to a second line, add them to cart and submit the order, does this generate two separate (ie not mixed) orders?