If this picture is anything to go by, the loads were not necessarily sheeted:
I actually found a Tunnel Cement thread on here, but it gives us no clues as to sheeting arrangements:
Surprising…did they only work in good weather? 
And max speed 30 mph (in a rigid-4) giving you the chance to complete a night trunk in driving rain a good twelve hours (allowing for loading and unloading) to solidify the bags of powder: a mystery indeed!
Your earlier picture shows sheets on the top of the cabs. But it is not clear how they would be secured to the bed/rave.
Love the white overalls. 
The photo was apparently taken at the Cummins plant in Darlington and was the award ceremony for “Cummins driver of the year competition”
More likely if there was no chance of rain then they didn’t bother covering the bags, especially if the delivery was fairly local. Would save a lot of time, perhaps enough to get an extra run per day out of the wagon.
An extra run?
Or an extra cuppa on the way back? 
I acknowledge all of your replies, but it still remains a mystery to me, in a country where you can never guarantee that a sunny day will not turn rainy at a moments notice.
The bags are obviously stacked for safety, but the sheeting ??
I had a mate who worked for Blue Circle from a depot at Beeston near Nottingham. If I can find a contact address, I’ll ask him. 
I found this comment from Deckboypeggy on the R&Sheeting thread. It sheds a light but doesn’t tell us where the sheets were secured.
HI to you all as regards loading cement, first layer on the deck ,second layer. start half a bag in, 3rd layer further in and down the middle either one or 2 bags depending on weight only sheeted if wet I loaded tons from RUGBY.
Well, I think I’ve found the answer. Here’s a pic of a brand new Leyland Comet cement lorry. You can clearly see the rope tie-off hooks along the bottom of the panelled side.
Two pictures here for Dennis aka Bewick as I know he will like both proper jobs but for all as well.
Mike been raiding the tea tin again
Photoshopped, obviously. Since when did the sun come out at Shap? 
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New into service April replacing a double drive 580. This new unit is driven by senior MAP Driver Jason Cope.
Don’t reckon 
much to the Foden though !
You missed the point there Dennis, it wernt the Foden you were supposed to look at it twer the rope and sheet job 
JD
I’ve seen tidier Scots loads JD and I’m not so keen on the twisted sheet ends around the headboard either ! 6/10 !
The sun always shines on those self righteous Cumbrians Park Royal i will mention no names 
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With you there. Good way to get a boot-full of water if it rains too.