Vetrazin already doesn't work in our area, presumably a result of acquired resistance. CLIK still works, but have you carefully read the list of handling and health precautions? We use it, but with some misgivings. I wouldn't use rubber rings on tails if the lambs showed any sign of distress as a result - but they don't.
We, like many pedigree breeders, don't castrate because we rarely know for sure whether a ram will turn out good enough for breeding - or not. Ram taint certainly is a problem in the breeding season, and our ram lambs have to go for slaughter before September, or get left until next spring when the hormone levels have dropped again. This works, but castrating very young lambs is better solution if you can do it.
In my opinion, anyone that lets an uncastrated tomcat into their house is a nutter, and very few do. What's so different about lambs?
To be fair, I think the report does say tailing and castration should not be done without good reason: well I think most of us DO have good reason.
Dick Plumb