In the session of 1606–7 he was again in trouble, attacking George Home, 1st Earl of Dunbar, the king's Scottish favourite, and generally criticising the bills brought in for effecting a partial union with Scotland, while he fell under Francis Bacon's suspicion as having had a hand in a book published by the puritan lawyer Nicholas Fuller.
A Mr Dummond, perhaps the courtier John Drummond of Hawthornden, advised him to enlist the help Arbella Stuart to gain the support of the Scottish Chancellor, Alexander Seton, 1st Earl of Dunfermline.
[1] On 23 June, 1610, he asserted that the law of England extended only to the low-water mark, and the king might therefore restrain all goods at sea from approaching the shore, and therefore only allow their being landed on payment of a duty.
Yelverton offered £500 towards the cost of The Masque of Flowers produced to celebrate Somerset's marriage to Frances Howard, but Bacon insisted on paying the whole charge.
About the same time he joined in signing a certificate in favour of the chancery in the conflict with Sir Edward Coke on the question of praemunire.
Becoming himself one of the commissioners on 22 April 1618, he was subsequently placed on another commission issued on 20 October authorising means to be taken for the punishment of offenders, and in 1619, the silkmen having refused to give a bond to abstain from the manufacture, he committed some of them to the Fleet prison; but being unwilling to bear the responsibility, announced his intention of releasing them unless Bacon would support him.
On 27 October, Yelverton more expressly acknowledged his offence in the Star-chamber; but this was again held insufficient, and on 10 November he was sentenced to imprisonment in the Tower of London during pleasure, fined, and dismissed from his place if the king approved.
On 18 April, 1621, he was fetched from the Tower to answer charges brought against him in the House of Lords, where he stated in the course of his defence that his sufferings were, in his opinion, due to circumstances connected with the patent for inns.