With the introduction of the residential nil rate band I thought we might have a new form 205. Suppose for example a single parent has died leaving everything to his adult son, the estate includes the main residence and therefore the extra residential allowance of £100,000 is available making a total inheritance tax free sum of £425,000. It seems that you cannot use the simpler form 205 if the estate comes between £325,000 and £425,000. The formidable IHT form 400 has to be used instead.
Perhaps a change is in the pipeline because it would make administration easier for executors and their advisers. Watch this space.