I’ve posted previously under a different NN.
XH came to the first financial hearing with a hand completed form E and a solicitor he had instructed just the day before. He claimed he had posted form e to me and court but neither received it 
I’ve had a look over it and he’s missing lots of details - the most concerning to me is his pension. He claims he has just £400 in a workplace pension but I know from when we were together he has been saving since age 16 and should have a very sizeable pension now.
My question is, how do I prove it? I’ve found pension tracing services. Can I use these (guessing no for GDPR) or ask that he does? Is there another way?