I started a similar thread albeit under a different heading about this same topic asking who had done this before. Since my original thread I have done further research and my spanish tax lawyers have highlighted some useful information to me.
The transfering of spanish property to a UK company will have taxes and expenses related to it and the inheritance tax is very difficult to foresee. If one was to die today, with a mortgage on the property probably the heirs wouldn´t pay anything, and in the future is very difficult to make an estimation.If one came to spain to live, the property becomes your habitual dwelling its value for inheritance tax will be reduced.
The transfering of a property into a UK company will be taxed with 1% over the value and it is true you won´t be charged with the every year non-resident tax. On a 300k euro property this tax won´t go probably further than 300 € per year, and 1% of the property could be around 3.000 € so after 10 years you would stop paying taxes.
The IBI tax you would pay it either way, under a personal name or a UK company.
Overall as everyone's personal financial circumstances are different it is prudent to get bespoke advise relevant to you.