Lord Christopher was sacked as estate comptroller by Lord Bath in July, less than a month after their father's death, amid bitter acrimony.
He has been served with a notice of eviction from The Hermitage, a mile from Longleat House, near Warminster, Wiltshire.
Lord Christopher was last night with his wife at her two-bedroomed cottage in Quenington, Cirencester, Gloucestershire. At the time of his dismissal Lord Christopher said: 'I just don't know what will happen about my house because it belongs to the estate. I just hope I will be allowed to stay there.'