Birmingham Dribblers! What a name, although quite appropriate I would think. Imagine filling the burner with meths, lighting it and sending it across your carpet, not sure it would comply with health and safety!
Thanks for the information, this pair are definitely tinplate and peering into the fill plug holes reveals a 'certain' amount of rust. I know my Dad painted these many years ago in good faith but in hindsight it obviously wasn't the thing to do.
At least I now know a bit about them – I used to call them Bing Tinplate Engines.
Alan