Rob - I did have two of the Mondo "E" base yellow models and they both came with the half moon topped suction only floor head instead of the 2 way pedal floor head as standard. One model had an older yellow bin release button on it and a smaller power on button; the newer Mondo E had a better one, as shown in your photo and a bigger on button. Compared to the higher end models, the Mondo E was made in Poland and none of them had piston bag valves as clearly can be seen in your photo where it has been blanked out. There were two models: 1150 E and 1151 E, both came with around 5 metres length of power cord compared to more on the higher end models and a clip on hose attachment with 2/3 storage points for the tools, a design feature that was applied to ALL the Mondo series because there was never a place on board the machine to put the tools on. The Mondo E was my favourite out of all the models - as you say and quite rightly - they are very quiet in use and also I believe, better made even if the cord storage thing was a bit of a faff - and whilst there was a 1300 watt version, there was also an 1100 watt version.

The problem with the higher end Mondo's (and I lived with a girl who had the 1400 watt version of the Mondo that Ry-Ry shows here but with a slider suction control and a blue/black colour, also known as "Smart Vac") was that the filter door at the front was inclined to blow off in use, if it didn't click down properly. This seemed to happen regularly on longer term owned models where the click lock from the plastic and its corresponding hole began to weaken and since those models were fitted with higher features, the filter cover was made smaller compared to the larger, better fitting one on the base models. Eureka in the U.S had the Mondo bodies too and there was also a commercial version too, whilst Volta in other countries sold the base Mondo E in red.

TBH at the time of purchase there were better cylinder vacs on the market - Hoover's Arrianne and Telios models were both on the market by then, offering either auto cord rewind and in the Telios case, on board tool storage/under a flap as well as bag full indicators and usually, variable suction control/slider. I eventually replaced one of the Mondo E's with a Hoover Telios. I did buy the Z2305 model in later years too, known as the Electrolux Mondo Plus, used the same dust bag and on board storage under a flap, but had terrible build quality compared to the Polish versions and a lot noisier.

Yes VR you are absolutely correct - the tool caddy was intended for the tubes but it also had the ability to go on the hose as well. I do recall it being wobbly but also not badly made. As for the tubes, I never had plastic tubes with my base Mondo E's yet - they came with the standard 2 part tubes with rubber inserts at the top to make them easier to remove when required. The floor head though was naff for hard floors though. 

My friend's Smart Vac came with silver telescopic stainless steel tubes, similar to the ones shown.