Venetian is my go-to shoe care gunk for all shell cordovan pairs. It saves me the trouble of buffing for a whole 30 minutes for that special otherwordly shell shine. I'm sure its main ingredient is tears from unborn baby kittens.
I favour Jaeger, being 185cm and 70kg. Their regular prices are around 550£ for a suit, but Jaeger's sales discounts are very favourable. The maker's basic cut, Mayfair, is definitely slim when compared to most British businesses, and their Tailored cut even more so. Jaeger has the best RTW cut for gangly men I've found so far.