The threshold for sound mind is a little more stringent for an irrevocable trust than for a revocable trust or a will. As with will contests, a trust contest is typically a full-blown legal proceeding involving a trial. Breaking the trust would ultimately come down to the opinion of a judge.
A quid is a slang term for an english pound (currency not weight). Bob is slang for an old english shilling. Currently it's 100 pence = one pound. A shilling would be now worth about 5 pence today. It used to be 20 shillings made a pound.A shilling was 12 pennies.
The UK currency is the pound sterling (Â£), with 100 pence (p) to a pound. 'Quid' is a slang term for pound. Several Scottish banks issue their own bank notes which can be used in the north of England and in Northern Ireland, but may be refused elsewhere. UK banks will accept them but foreign banks generally do not.