As above, it's highly unlikely you will have a structural problem.
For complete peace of mind, though, you need to first get the SE on board to provide the figures. If he's happy, then apply for your regularization, but it will cost.
I did a regularization in Manchester just over a year ago, and they charged 250% of the normal fee. Their normal fee for a job such as yours would be £225 (assuming under £5K). So you do the maths; unfortunately it's not gonna be cheap.
For complete peace of mind, though, you need to first get the SE on board to provide the figures. If he's happy, then apply for your regularization, but it will cost.
I did a regularization in Manchester just over a year ago, and they charged 250% of the normal fee. Their normal fee for a job such as yours would be £225 (assuming under £5K). So you do the maths; unfortunately it's not gonna be cheap.