Tern make a wide range of folding bikes – all with aluminium frames, but in a range of wheel sizes and components. In the shop at the moment I have:

Verge N8
Verge N8 – A light, fast city bike with hydro formed frame, sporty riding position, and 1×8 Claris drivetrain for only £850
Link D7i
Link D7i – with enclosed 7-speed hub gear and protected chain, and mudguards and rack fitted as standard, this bike is ready for all-weather commuting – £850
Link C8
Link C8 – the entry-level bike, still with a fast-folding aluminium frame and 8-speed derailleur gearing for only £650
Vektron – folding electric bikes from £2300 – click for lots more info…
GSD – Tern’s non-folding electric cargo bike – click for more info…