Welcome to FT!

You should have posted your Q in the LH forum for better/more detailed response. However, you don't need to state why the flight was delayed in order to request EU Reg. 261/04 compensation from LH. Just submit a complaint on the LH webpage that that you were rerouted due to delay of LH 577 and that you arrived BHX 22 hours later than scheduled.

Be prepared that LH will most likely deny your claim (this appears to be the strategy of LH for most claims) and that you may have to reply firmly maintaining your claim. If the delay was caused by extraordinary circumstances, there is no right to compensation under the EU Regulation. LH will explain to you if this is the situation.