The main problem and concern is I have realised I have logged some flights incorrectly. In other words I have logged a check flight as P1/s and 'In-command' time, realising that it should be P.u/t and dual time.
Just a suggestion.
How about not tippex-ing out anything but adding a note to these entries along the lines of "incorrect - see page XX". Probably in a different color pen so you can see that that note was added later.
And the on page XX, line 1, you copy over the (incorrect) totals that were listed on the bottom of page XX-1, then add negative/positive entries correcting your original errors on subsequent lines, tally them up so you have proper total numbers, and carry on forward with correct numbers from then on.
This is how bookkeepers have corrected wrong entries in their ledgers for ages.