Thanks for the tips.
Cold soba is one of my favourite noodle dishes. Can even do without the tempura or any side dish, just the noodles, the dipping sauce, spring onions and wasabi are sufficient.
Funnily enough, hot soba or udon have never been my cup of tea.
Another delicious cold noodle dish that I have eaten in China is their "Liang Mian".
It's dry cold noodle, with chilli oil, spring onion, chilli flakes and peanuts, sometimes with an optional sprinkling of sugar on top. Most comonly found in szechuan restaurants.
The prc migrants have tried to replicate this in SG, but those that I've tried are very oily and not tasty at all.