Timezta,
3. Sea Dart in the surface role - the enemy would have to be pretty close, but it is a big old missile going very very fast (remember Harpoon is subsonice), Sea Dart weight half a tonne and is going well over Mach 2. Going to make one hell of a mess.
Sea Dart does have a limited anti surface capacity, but with a range limited to radar horizon, which makes of marginal use. I saw the result of a Sea Dart trial against a former MTB (Brave class) and it made quite a mess against a small target. A limited warhead, and a fuse that is likely to proximity detonate near a steel hull limits its use still further, although IIRC it did hit the hulk of HMS Leander during a Sinkex.
The example of Exeter's engagement against an A4 in the Falklands is a good one. Certainly, a fine bit of shooting by Exeter but it does highlight the systems main limitation - its easy to be overwhelmed. Exeter engaged 4 air force skyhawks, yet was only able to get a single shot off while they were still within the system's envelope. This is all history book stuff and hopefully the T45 should address these defects.