Possible Lightning Damage to Phone System (UK) ..?

A few weeks ago my router/modem and PC packed up and at first I thought that I had no BT Broadband supply. The BT engineer called and confirmed that my Broadband connection was fine but it seemed that my router had completely failed and the network adaptor card on my PC had also failed. He stated that lightning had struck my neighbours property on the same day that I had the fault ( blowing out their own BT Telephone box ) and I had probably suffered a damaging power surge as result. I have replaced the router/modem and had a new motherboard fitted and I am now back on line. However, I am left with severe crackling on some of my home phones, with one phone working fine. Can anyone advised if the other phones could have been damaged by the surge, or the telephone box/outlet or the broadband filters? And what should I do to test for any fault? All advice appreciated .......... Cheers