I sent mine out the last week of March and I got mine back today too!
I sent too much paperwork ( some of the same that I sent from the spousal visa I know a bit cheeky hmm) and 4 sets of my own printed passport pictures just in case one wasn't good enough. All 4 passports, birth certificates, marriage certificate, Life in UK test results, bank and bill statement 1 for each year in country, doctor appointments letters, DVLA papers any thing to show address and our names. A bit overkill I would think but better safe than sorry I say.