Seems to be a rebadged Tern P9. A bike and company that has had its problems in the past, though they seem over those now. Comparative Terns & very similar Dahons appear about the Internet cheaper than £900, as does the same Bickerton to be fair, asking about price matching, a straight out discount or free accessories / servicing may be a good idea if you do go for this one.
You do need to factor in lights, pump, accessories too by the looks of it which adds to the start up costs.
It looks to have usable spec, if not anything outstanding, The Brooks saddle is a nice touch but they take some work to get comfy and aren't to everyone's taste. (I love mine tho)
Just looking at your link and the specs for other bikes there, for the money I'd be more keen to test the 1707 City model, all in all you seem to get a better commuter package at £250 less.
The Nexus hub gear is a good solid unit with a perfectly decent gear range unless you're wanting to ride at 40mph or up the side of a mountain; being a sealed unit it is far less prone to getting caked in muck or knocks or going out of alignment and the chain should last longer as it is not flicking between cogs, you can also change gear stationary if you have to stop suddenly or miss a change before traffic lights etc - the payoff is that getting the rear wheel off is a tad more fiddly.
For the £250 saved you could upgrade tyres to Schwalbe Marathon plus or green guard which are top level puncture protection. You could also get decent lights, pump etc and still be on the same budget as the 1909 on its own.
For commuting most people find carrying luggage off the body a better option so the rack coming supplied might be a useful addition too, the right single pannier or a rack top bag would work with the fold.
I'm not sure what the saddle bag in the 1707 city pic is but suspect it will be a bike cover, depends on what the rest of your commute is but that could be helpful, some bus/trams require folded bikes to be covered to be allowed on - never strictly policed IME but also worth checking out with operators if you are planning a part public transport journey with it. Trains are usually a bit more relaxed and accepting of bikes. Even if you're part travelling in a pals car, it'd be courteous after a wet ride to cover it.
Not to put you off the 1909 but don't be necessarily be seduced by: if it costs more it must be better for what I need. Have a think about living with it and looking after it and the bits like lights you need to manage better in bad weather or as the nights draw in and for a partial commute, carrying Lunch/clothes etc and the bike when folded.
Whatever you get, enjoy it though, commuting can be addictive and is a great free fitness routine each day.