Help really appreciated
I'm going to trust you on that point Miss Mulan.
Your circuit won't be behaving like an active (and saturated) BJT any more - there is too much forward bias between base and collector for this to happen and, all rules about transistor amplification are laid-to-rest and, the BJT behaves like two forward biased diodes: -
Compare voltages and currents side-by-side and you'll see that they are virtually identical. The main point to note is this: -
the collector current is flowing from the collector to the 1 volt
power supply rail via the 100 Ω collector resistor.
That means all bets are off when trying to analyse this circuit as a bona fide BJT problem because collector current is flowing the wrong way.
BTW the diodes simulated above are 1N4148 devices. So analyse it as two diodes instead of a regular transistor.