Ask an Property Solicitor. Get an Answer ASAP.
I will now turn to your enquiry and assist you as best i can so please bear with me.
Usually you would need to write to the company at the last known address or ask companies house to confirm the details they hold for the company or subsequent company formed.
Did the seller undertake any works without consent or make any attempt to contact them?
As you already have a solicitor acting they are best placed to advise you on how to contact the company.