Been there,
I hope that you have stopped making an AVC payments that you may have been making. I hate to sound mercenary, but anyone who has divorce even remotely on the horizon should strongly consider doing so. And have you considered offsetting or earmarking instead of sharing?
The pension sharing order refers to your accrued fund value on the day before you go to Court (hence the need to stop AVCs). The fund itself, up to the point it is split, is your exclusive property. Therefore the only part that has value is that part that has accrued. AA makes the point that if something does not exist, it cannot be shared.
Clivena Thomas used Human Rights and Gender legislation (without success) to highlight an unfairness. If your wife has a switched on solicitor, you may do well to anticipate being pinged with a (if applicable) modified maintenance order to make up for the difference in time between you retiring and taking benefits, and your wife being able to do so, at her age of retirement.
If you have not already independently instructed on the CETV, discuss with your wife the possibility that you'll jointly agree on one. It could save time and hassle. Finally, seek credible advice in the real world which may more accurately reflect the entire picture!