Looks like clutches are a weak-spot. Mine went after just a few 100 miles too. Was apparently a damaged seal in the hydraulics.

To date:
Passenger headlight replaced
Steering box replaced (fixed wayward handling)
Clutch failure fixed
Rusty drum brake coated
Rusty exhaust addressed
Boot lid realigned
Bevel box breather repaired to fix oil leaks
Belt adjusted to stop creaking and squealing
Fuel evap whine fixed (hopefully - its with Morgan right now for that one!)

So far I have owned my Super 3 for 166 days which breaks down thus:

Working
18 days

Faulty but drivable
82 days

Not drivable/at Factory
66 days

Heron Grey & Typhoon British Green Super 3 SOLD
Plus 6, Silver and tan.