In terms of his pension it would be better to stay with his final salary pension, but we have major debt problems at the moment so taking a look at the whole of our finances if there was a cash incentive to change it would be beneficial for us to do so.
However, it turns out there isn't in this case. The offer is transfer only, so there is no point in us doing it.
If your DP is under 55 then the money can't be touched. It must pass to another pension. If DP is over 55 then you could crystallise the benefits and take 25% tax free cash (and any protected amounts) and then use the rest to purchase a pension, or go into drawdown and leave the pension until you need a regular income.
Ensure he takes INDEPENDENT advice on this. The figures can look tempting but a buyout unless done on a nil risk basis is often more for the benefit of the closing fund and not the ex employee.