I have seen #838 with a 12p cover prices. Guess there are loads! Difficult to value as they don't seem to come up for sale that often so I will keep a close eye out in future.
More recently I have seen issue #1217 so it went into the 1990s. Is this the last issue? I will keep searching for that last issue!
Very early issues will command values as they are so hard to find.
Note: some PR issues may have no value. Selected issues in FN, VF or VF/NM may not exist in some titles.