Hi Rhod6, the description is a dead give away, I wouldn't touch this bike with a bargepole. Most of us wiould recommend that you purchase a bike from a Local Independent Bike Shop or at the very least from
Halfords. What you are looking at is what is often referred to as a Bicycle Shaped Object. It's the kind of thing which is built to a price rather than a minimum level of quality and as such will have a very low level of componentry on it. If you are after something which will be enjoyable to ride, fit you properly be reliable and be easy to work on a mail order, assemble it yourself BOS is not the way to go.
Each of us Cycle Chatters will have an idea of a personal minimum level of quality which is acceptable. For me that level is around £180. I work on bikes every day of the week and one of the things I have learned is that a cheap bike takes twice as long as a quality bike to assemble. Anything over that £180 magic number will go together easily because the frame parts are at a level of quality which means that the threads are straight, drop-outs are parallel etc. I, as an experienced cycle mechanic can assemble a quality bike in 45 minutes, that's from a box to ready for the road. Ive had the misfortune to build a few BSOs and they can take more than twice that time to do a PDI. That's with thirty years of experience, a professional workstand and a workshop full of pro tools. You with your limited experience and the crap tools supplied with the bike will be lucky if you ever get that bike into decent shape and you'll be opening yourself up to a world of frustration. The indexing wont work, the spokes will come loose etc, etc etc and it'll end up sitting in the shed under a pile of paint pots. Cycling is a joy, it's why we do it but riding that thing will be an uncomfortable and miserable experience.
If £180 is too much money then just save a little longer because one thing is for certain, bikes like the ones sold by Argos, Tesco and Sterling House put more people off cycling than anything else.
Take the time to wander around your local bike shop-
anything they sell will be better than the one you are looking at.