proventiallady why do you say that?
I work in ED and whilst 111 has many many (many!) faults, as a PP said, it is notoriously cautious and will send many things direct to us. Therefore, with the same toxicity info that we have (via toxbase) you can be sure if they haven't sent someone to ED for a poison query, they don't need to be there.
As it is, OPs probably doesn't need ED. So long as he's asympyomatic, all they will do if keep an eye for 4-6 hours post ingestion. If he got any in his eyes etc he may need washouts but it's not paticularly toxic.
BUT OP has equally done nothing wrong in going to ED if she's concerned. With a decade of experience in emergency care I can assure you, a worried parent is not the cause of the A&E overcrowding crisis 
This site can be ridiculous in how it treats people and how some posters with no medical knowledge and frankly often no common sense love a bandwagon to jump on. Some posters telling OP she's stupid and irresponsible for not going directly to A&E rather than posting for a second opinion, then some telling her she's irresponsible for going and misusing the service. FFS.