Thanks for the information! So could I grow on things like aubergines or tomatoes over the winter using the aeroponic unit do you think? And keep them all indoors in a warm environment?
The aeroponics unit (particularly if you have a fogger, rather than just a mist spray, in the bottom) is just for propagation. I have one, used it for Fuchsias, got 100% success with no bother - but then Fuchsias root easily anyway. I always wanted more cuttings than the number of stations in the aeroponics unit so I ditched it in favour of just using compost in pots the conventional way. I also found that transitioning from fog/mist as the root medium to soil/compost was traumatic for the plants, so that also causes me to favour striking cuttings in compost now.
You won't grow Aubergines / Tomatoes (nor similar crops) productively through the winter unless you have heat and light. You won't get enough light from the sun, so you would need to supplement with a growing lamp. That won't be anything like cost effective, you need a really high value crop
to make that pay.
I use a Metal Halide growing lamp to overwinter some plants, and to bring on others. They are all tender and tend to be rare or precious, and thus the cost is justified to me. Lamp costs £100-150 and costs about £100-200 to run for the winter season (depending on number of hours per day). It will light an area of about 2 sq.m. Other options available, in particular LED and Fluorescent tube type lighting rigs which are ideal for seedlings (as they have to be within a inch or two of the plant), where Metal Halide / Sodium has much better canopy penetration and thus is suited to taller plants.
I do find the supplemental lighting very useful for seedlings started early, particularly in a lousy spring, with such low light levels, like we had tin Spring 2013. I sow early, and bring on strong plants ... but ... as soon as they need to be potted on I don't have enough illuminated area to grow them on, so they have to go into greenhouse ... so growing space under lights is limited.