From the comments:
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tonyb says:
A few months ago I wrote Part 1 of ‘Historic variations in sea levels-from the Holocene to the Romans.’ It is here
A much more comprehensive version is here.
http://curryja.files.wordpress.com/2011/07/document.pdf
It is clear that there are considerable variations in levels which may coincide roughly with warm/cool periods. We are currently around 20cm or more BELOW the levels that occurred during the Roman optimum. There are a couple of useful graphs in the article towards the end that show this. As our current temperatures are somewhat below that period it seems unlikely we will reach it (unless temperatures continue to rise strongly) although there is the considerable wild card of the pumping of water from underground sources which may affect levels in a manner that hasn’t happened in previous sea level changes
tonyb
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Graph from the first link:
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