Some of you have it right some so wrong.
What Stanmapstone said is correct. The only way to get the original is to apply to the local RO, the cut and paste job done by the GRO in Southport is from a microfilm copy of the original transcript, or if they are using MAGPIE a computer scan of, the microfilm copy, of the original transcript.
I unlike most people I don't think that the GRO indexes are that bad, and have lots of errors, or things missing. I also don't think that the quarterly returns were that bad. I don't think that there are many missing entries, I don't however believe in rouge entries and if something is in the index then is should exist and it best to check in a local RO if the GRO claims so.
Not all RO will give you a copy of the original, some will write it by hand, some will use a photocopier (with a mask to cover the other bits of the original page), some can computer scan it, others only have transcripts them selves especially when dealing with marriages as the original is held in the church; it just depends on the RO.
Keziahemm, I think what you do is make it hard for every one and the reason why the local RO want to charge more. It takes probably 10 mins max to find a birth or death cert, as in most RO's there will only be 1/2 a dozen sub districts to search per year to locate the entry. However it could take several hours to look through the 100's of churches to locate a marriage. It may be nice to see the original occasionly but unless it is really needed it takes up a huge amount of time to apply for marriages at local RO's .