Even if the other one has a good crossover, it's unlikely that the coils are marked with their values, and often the capacitors aren't either.They were fairly good cabs at one time, check the surrounds for rotting, its a problem with some wharfedales.
You might not be able to get a schem, are you trying to repair one?, if so use the other to work out what you have, presuming the other speaker has a good xover.
Funnily enough, back in the 'real' Wharfedale days I had a pair of Wharfedale Denton's - within a few days the tweeters both blew. So I rang Wharfedale, and actually spoke to the guy who ran it, he was a really nice guy. He explained that due to a manufacturing error, they had fitted the wrong crossovers, and the crossover frequency was far too low (some thing like 800Hz instead of 4KHz) - so he sent me a new pair of tweeters and crossovers, job done, never failed again.I would like to find a spec sheet .... have one blown speaker ( mid range voice coil blown : cone and coil fozen and cannot move) and one questionable woofer .(cone& coil move but not really smooth as a new speaker should.) I may try experimenting with crossover points as well as adding a fuse assembly and possibly an L-pad on the tweeter. This model was really pleasant to listen to when they were new but have deteriorated over their 30yrs of use . The 510.2 models had a design flaw with drivers and tweeters being overloaded when driven at a higher volumes. I was hoping to correct this by altering the crossovers with a different frequency curve . If I can't get spec info . I guess I'll have to experiment! Thanks , BillyV