Explain the “starter cranks” and “classic car won’t start noise”. Do you just get clicking when you turn the key or does the starter seem to run but not turn over the engine or does the engine turn over but not “fire”?
If you just get clicking, suspect the battery or corroded terminals on the battery.
If the starter turns but the engine doesn’t, there is probably something wrong with the starter solenoid or gear alignment.
If it sounds the way it usually does with the engine turning over well and at normal speed (sounds normal) but it just doesn’t start, it is probably not the battery or starter.
You basically need compression, spark and fuel mixture for a gasoline engine to run, so try to isolate these. If it turns over well, you will get compression, so check fuel and spark.
Consider what could have happened since the last time you used the car.