Watch: Professor John Dyson's inaugural lecture at the University of Birmingham – 'In search of treasure and redemption'

This design is so that the cable when pulled isn’t flexing at one given point – which as we have found out, makes the flex liable to break internally.

The Sebo Dart.. Another twin motor machine, the Sebo dart is the commercial variant of the domestic Sebo Felix.The Dart is a favourite of hotels large and small.

Watch: Professor John Dyson's inaugural lecture at the University of Birmingham – 'In search of treasure and redemption'

As well as larger hotels like the Waldorf Astoria, many guest houses, boutique hotels and those with holiday and/or caravan lets tend to buy the Dart.They are very versatile and quite inexpensive.Not a bad choice if you only want one or two effective machines, have many confined spaces and/or lots of soft furnishings and feel you dont need a huge machine..

Watch: Professor John Dyson's inaugural lecture at the University of Birmingham – 'In search of treasure and redemption'

Above is a Sebo Dart being used at the Waldorf Astoria in Berlin..The Dart has a “Flex” neck, S-Class filtration, an on-board hose, a crevice nozzle, 4-level height adjustment and auto shut-off.

Watch: Professor John Dyson's inaugural lecture at the University of Birmingham – 'In search of treasure and redemption'

The standard Dart vacuum has a 31cm brush width and weighs in at just 6.7kg.

The Dart’s “Flex” neck gives 90° vertical and 180° horizontal movement, providing superb manoeuvrability for fast cleaning around obstacles such as furniture... How Much Does a Sebo Repair Cost?.

A quote is always free.We have a minimum charge of £20 for small jobs.

As an example, a replacement while-you-wait power cord replacement costs £35 all in.Typical labour charges for other repairs are in the region of £35-55 depending on the repair.