Feh on the naysayers - it's a mighty fine SHTF rifle.
It's light, has excellent sights, shoots a full size round (evidently some see this as a negative, some as a positive), carries ten rounds, can arguably be worked faster than any other bolt action made, and has an indestructible quality that few rifles can match.
No other rifle, for example, would have likely dealt with the water and mud of the Gulf Coast disaster as well as the Enfield - you'll not likely EVER clog the Enfield action with mud. The rear locking lugs make the action inherently easy to clean of debris and muck - can't say that for any of the forward locking lug crowd. WildAlaska/Ken did a thread on this a couple of years ago, challenging ANYONE to provide an example of a more abuse-tolerant rifle. I can't recall seeing any real contenders to the crown.
The 303 British round is still factory loaded by Remington, Federal, Winchester, PMC, and many others. The South African-made PMP ammo is first class stuff, and at $8/box of twenty 180gr. JSP it's about as cheap as you can get outside of MilSurpLand. It's not like a SHTF scenario would require more 303 Brirish ammo than a single person could reasonably purchase and have handy....
Now, in a true TEOTWAWKI scenario the 303 round loses a bit of luster (due to the fact that it'll not be *as* available as 308 or 223 or 30-06) and a chopped Ishapore 1A/2A Enfield in 308 might get the nod. Having multiple examples of both, I can tell you that the Ishy's are not in the same class as the No4/No5 with regard to sights and workmanship - I would default to the No4/No5 in a SHTF situation and grab the Ishy only if I didn't see any prospect for life returning to normal any time soon.