Ok, my method..
One piece of freebie sample waterproof canvas courtesy of deck chair stripes
one permanent marker in black and some colouring in plus scissors later
one more snip
Two patches that are waterproof and so far... cost nothing.
next, one can of spray adhesive which i had lying around from a carpet repair
one hole in roof caused by metal bars rubbing
one patch on the inside, not the neatest of jobs but it stops the daylight coming through on the inside and now its water tight again.
Will do until i can replace the roof ready for next summer.