You are quite correct, "Raleigh Classic 15 Tourer" it was about £350. Seems odd but everyone was amazed by the three front cranks. I have had one in constant use since. If you are sufficiently interested I have a copy of Cycling Plus from September 1984 with a two page advert for the bike which I could scan and email you. Somewhere is the "signature of the man who build it". It was the top of their range and positioned to compete with the Galexy. Sadly as a result of 21 years constant use there are relativly few original componants in mine and as you say it is hard to find spares that fit. Each time I go to the bike shop it becomes more confrontational! It has just this month gone into semi retirement, I have a beautiful new Specialized Elite. By conincidence, (I only noticed after the purchase) the key remaining componant, the brooks B17 saddle, has developed a tear. I was shocked, its only 21 years old! I have replaced it with a new B17, but I am afraid it is only for taking to the station today.
If you are interested in a scan of the original advert, or have any of the original parts you are ready to get rid of I would be interested. I am sorry to inform you that the Guarantee for the Frame expired this year (it was a 21 year guarantee). Its finest hour was the famous Swiss Cottage to S****horpe cycle marathon. Only ever done once by three brave and young members of Hampstead and Highgate Labour Party this 180 mile non stop trek took all day. Only made possible by Mars Bars, Lucozade and a Brooks B17 leather saddle. God, how did I get so old!
Here is to the next 21 years, I suspect the Classic will still be running, long after the Specialized Elite has turned to Carbon and Aluminium dust.