I don't know if your looking for a rim from 80's but Velocity makes a modern clincher 520c (most common pursuit 24"). http://store.velocityusa.com/p/a23-24-520-msw
Might be tricky to find in uk but from states you can get one.
tire is another thing - tan wall or black? Panaracer makes clincher tan wall 520-25. Probably not the best tire but fits the description.
I myself bought tubular HED 24" and Vittoria juniores tire on it.
@Jere started
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I don't know if your looking for a rim from 80's but Velocity makes a modern clincher 520c (most common pursuit 24"). http://store.velocityusa.com/p/a23-24-520-msw
Might be tricky to find in uk but from states you can get one.
tire is another thing - tan wall or black? Panaracer makes clincher tan wall 520-25. Probably not the best tire but fits the description.
I myself bought tubular HED 24" and Vittoria juniores tire on it.