I hope they are the new leaded windows with stuck on lead, They would be fine.
The old lead windows, and the word Hall frightens me, can be a nightmare when they leak.
Blame the EEC, WAHL, Your insurance company, and any one else you can think of for forcing you down the wfp road. Don't let them think for a minute that you have done it from choice. Moan about being forced to spend loads of money in order to comply with the new regs. Use their sympathy to ward off any apprehension they may have. Tell them you much preferred the old way.
AND LAUGH ALL THE WAY TO THE BANK. Dai