Historical UK Sea Levels
If we looked back a little further towards the Middle Age, we would find coastal fortresses and defenses that were clearly meant against ships some km inland in the UK and in France. The sea level must have been quite a bit higher at the time. The fact is that the sea level is very dynamic. depending on where you are and how warm it was at the time more or less water, hydrostatic rebound, and ground compaction produce a wildly differing picture. What we know is that the sea level a little less than 1000 years ago must have been higher than today. All that without human-made CO2.
Watts Up With That? 
