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Well the site has been active for 10 months and most pages have very consistent keywords. It just seems strange that for a page that hasn't changed for 10 months it can go from not in the top 50 to ranking 1st to not in the top 50 in the last 3 weeks for 2 different keywords...

but maybe google is seeing it as a new website? even though we used to rank highly for those same keywords on the old website (which was active for 4 years) with all relevant 301 redirects in place

SEOMOZ told me to ask the question here because they say their ranking programme now works correctly and the problems I was having before with keywords changing so dramatically, even though nothing had been changed with regards to optmisation, is now to do with google rather than their ranking tool

do google really change their algorithms on a weekly basis so that rankings can go up by more than 50 to ranking 1st to then going down by more than 50?

Any hints or tips from anyone on I can keep the rankings more consistent (maybe dropping or increasing by one or two places week by week rather than changing by over 50 positions?)