I just looked at my save, so I can say a few things for certain. We are getting a GP first, no question. The GE won't come in time to help build the HG. Not a problem really. Here's my reccomendation.
As soon as we get Monotheism, do a twin revolt to Representation and Organized Religion. Add GP to Nottingham as a Super Specialist. He'll contribute some production to our GL. Make the trade with Fredrick a.a.s.p. to get Math. Start building Aqueduct in London, then follw up with the HG in London. There should be no need to rush it. Why? Becuase I doubt anyone has a capital with better production, we will have stone, we'll be running OR (cost 25% less) and we've been dominating so far. After that's done, add the National Epic in LONDON. We'll never need to commit turn after turn of hammers to another Wonder again.
Your right, after Monotheism, go get Lit and build the GL up in Nottingham. Sankore, the next Science Wonder, can go there later. The idea, is trying to keep the purity of the GPersons you see.
So far we'll be generating Prophets in York, Engineer's in London, and Scientists in Nottingham. That's why Must build the GL in Nottingham and not in London, as the idea is to be able to plan ahead how we are going to use our Engineeers/Scientists/Prophets.
EDIT: Oh, and as for the matter of attacking. I would have wanted to attack sooner...but no one was even close! That and I find attacking cities are paisn without siege weps. Anyway, what we've been doing is setting up a firm economic basis to playout the rest of the game. After we get the GL and the HG, we'll no longer have to worry about building Wonders we want. Infact, we'll likely have so many GE we'll be hard pressed to find a Wonder for them to build. After you finish building the HG in London and GL in Nottingham, lets build some Swords and Catapults and send Ragnar packing!