You can buy 1ltr of it for £10.99 from here for delivery http://pigeons.taylorschoice.co.uk/products/163739_orego-stim_1ltr.php
Last year it was about £7.99, prices of everything are going up so much lately
Sounds a bit like canker :-/
Have a look at this http://pigeons.taylorschoice.co.uk/pages/Pigeon_Health_Problems_and_Solutions.php and read the symptoms
Bamfords prices are only coming down in december because they reducing their bags to 20KG from 25KG :-/
It remains to be seen if on a pro-rata basis if they are cheaper!
You can buy a droppings and swab testing kit from here http://pigeons.taylorschoice.co.uk/products/163914_dropping&&swab_testing_kit.php and simply send off in the packaging provided and you get your results within 24 hours.
Chris
You can buy vita-pro and tranz-form here http://pigeons.taylorschoice.co.uk/ but nto sure about brux, it will probably be available in blackpool though if your going.
Chris
I find this a brilliant website for pigeon products and advice. If you go to this page http://pigeons.taylorschoice.co.uk/pages/Pigeon_Health_Problems_and_Solutions.php it has many pigeon health problems with detailed information and it also provides treatments. If you have a look at canker (or trichomoniasis) you will see there are many treatments available.
Hope this helps
Chris