My initial thoughts were correct, I've taken a look through a few Raleigh brochures (hardcopies) and the Classic 15 first appears in 1985 and does not appear in 1987 (Randonneur appears in 1987).
And for the benefit of other posters, if you know your Raleighs (or think you do), then you should know the Royal does not have a half chrome rear triangle or fork - neither does the Randonneur.
The chainset, correct again: Sugino PX, a TA lookalike...final thought - frame number will almost certainly begin with a W.
Very good frameset, and a very good bicycle when new.
Co-founder of a V-CC section, member South Eastern Road Club and owner of - 2005 Bianchi Reparto Corse (modern), 1985 Raleigh SBDU Pro Super, 1984 Raleigh LU Corsa, 1980 Allin Stan Butler Special, 1978 Ron Cooper, 2 x very early Roberts (late 60s/early 70s), 1975 Bill Philbrook tourer, 1966 Raleigh Superbe Roadster, 1964 Allin Stan Butler Special Belgique, 1951 Hobbs of Barbican S/C, 1950 Hobbs of Barbican S/C, 1947 Hetchins Super Special, 1908 Centaur Featherweight. 1988 Specialized Stumpjumper.