[4] After the passing of the Reform Bill of 1832 and the consequent disenfranchisement of this borough, he was returned to Parliament for Liskeard, a seat he retained until he died.

For a long time, it was believed that Buller wrote Lord Durham's famous Report on the Affairs of British North America.

However, this is now denied by several authorities, among them being Durham's biographer, Stuart J Reid,[6] who mentions that Buller described this statement as a groundless assertion in an article which he wrote for the Edinburgh Review.

Buller and Sir William Molesworth were associated with Edward Gibbon Wakefield and his schemes for colonising South Australia, Canada and New Zealand.

After practising as a barrister, he was made Judge Advocate General by Lord John Russell in 1846,[7] and became the first President of the Poor Law Board the following year.