When I bought my Europa I had to go out and buy lighter torque wrenches, as everything I had was fine for big American cars, but the little Europa needs a more delicate touch. I bought Gear Wrench 1/4" drive and 3/8" drive micrometer (click type) torque wrenches to cover the lesser torque requirements for the Europa's fasteners (I don't recall the torque range for each wrench, but can get this if you need). Buying a decent quality torque wrench is worth while, as accuracy is important and a good wrench will provide many years of reliable service. There is junk out there that is not worth having at all.
If you will be doing your own tuning, then another tool that may be worth picking up is a carb flow balancing tool. There are numerous types, and different people have their preferences. Also, a Colour Tune Plug is a worth while minor investment.
Also, go to an industrial supplier of quality fasteners and pick up a selection of UNF lock nuts (nyloc, etc) in 1/4", 5/16", 3/8", and a couple 7/16". UNF lock nuts can be hard to find when you need them, but are immensly handy when doing maintenance around the car. While you are there, pick up a small selection of Grade 8 (or higher) UNF bolts in lengths of about 3/4" -2". Some Loctite 242 (blue loctite) is worth keeping around, too. These will always be handy when doing Lotus maintenance.