Update: True to their word, a large box containing a brand-new bike arrived this morning in perfect condition and I get to try it out before the original bike with a fault on the lights/controller is collected probably next week.
The bike I bought is the Seago ePower and it is perfect for my needs. At 19.5kg it's one of the lightest folders, has front and rear disc brakes which I prefer, easily accommodates a +34" inside leg (and longer), has adjustable height handlebars and it actually fits me - so many I tried are designed for shorter legs and longer bodies than mine and are quite uncomfortable.
I would highly recommend both the bike, retailer (Pirates Cave chandlers) and company Seago Yachting. Before buying the bike, fully aware I was buying from a chandlery specialist rather than a bike specialist) I spoke to many ex-stockists (no bikes currently in stock until the new model is launched in October) for their views on the bike and Seago company and all were full of praise which has been my experience too. My husband already has their life rafts and some of their sailing gear and his experience has been positive too so it's a company I feel I could recommend with confidence, along with the bike as a lower-budget, practical folder which works.