RFI: Where Have All The Old Top 40's Gone ?

ok - spurred on by these recent 'best of 197x'-type compilation-threads...
since ilm heducated me in the ways of chart-pop (and since finally getting a minidisc player) i have been wanting to make a series of yr-by-yr compilations, one disc-per-year, each one composed only of UK Top 40 singles of that year that i actually liked (or remember now through a rosy glow of nostalgic/ironic retroactive dissonance-reduction haha)

i didn't think it would be that difficult to find books (or websites) that could provide week-by-week listings of the UK top 40 charts from whatever year you wanted, but it seems to be

googling 'uk top 40 chart listings' leads to 'everyhit.com' which is pretty good, but STILL doesn't provide the weekly rundowns - they combine them into 'top 40 hits of year/month' - most 'detailed' breakdown you can get is 'top 40 hits' of early/mid/late month...

the books i've found are either big-books-of-records types, structured on a name-of-artist basis (no use since sometimes i can't remember it until seeing the song in the context of the chart/year), or they cut down the sampling and miss out weekly data - again, monthly was the best i saw (and i can't recall how they average it out - total sales i guess rather than particular chart positions...)

ok so the contents of the charts used to change alot more slowly so it might not make much diff until late 80's(?) or whenever, but their may be some things that only just scraped in to the lower reaches for a week or two, and dammit the data must exist...

so - does anybody know where to access the Actual Real Basic UK Weekly Top 40 Singles lists going back to Nineteen Oatcake ?