The lightweight 2-in-1 detachable is probably epitomised for many by Microsoft's Surface Pro devices, but HP -- among others -- takes a stab at this form factor too, and its previous outing, the Elite x2 1012, was an impressive Surface Pro alternative.
Now there's a new version, Elite x2 1013 G3. With pricing ranging from £1,619 to £2,775 (inc VAT) there are plenty of configuration options, including mobile broadband.
HP Elite x2 1013 G3 review at ZDNet