All the car tax figures are on the BMW price lists for each model, downloadable from the BMW website. Note the first year tax is higher than subequent years, but is included in the OTR price so is kind-of irrelevant.
For a 35i (as I happen to have the price list in front of me) it's £550 first year, then £245. Same for 35iS. The 23i and 30i are £425 first year and £235 thereafter.
