I remember the model from when I was a kid. The O'Brien branded road bikes might have had some links to another Midland firm, Lew-Ways; they were based just outside Cannock on the A5 and did bikes - BMXs in particular - as well as kids' outdoor play equipment such as slides and swings.
I've stripped a few parts off for cleaning and it has the following:
Weinmann 999 601 centre pull brakes
Weizmann levers
Huret rear mech
Birmalux alloy rims
All have cleaned and polished up quite nicely
New chain and cables and then after a bearing check and grease time for a ride
It is an Edward O'Brien. Looks like one of the later Chinese made ones. For those old enough to remember, they were sold through mail order catalogues like Great Universal Stores along with the likes of Vindec. Used to see a lot of new shiney ones on Christmas day as they were tried out by their new owners up and down the street.