The problem is time and money, if you have time, thats good spend some time on the landy, keeping it in good order.
I think your lift pump may have gone, fear not this can be replaced for about £20 and its just 2 bolts.
Take the fuel out pipe off your lift pump, and then move the little lever on it a few times, diesel may come out the fuel out pipe - good, if not, give the engine one blimp on the starter to get it to turn the engine round a bit (reason for this is that the cam shaft which drives the lift pump has to be on the right side or the lever on the pump will not work - so you essentialy want to turn the cam over 1/2 a turn), then try the lever again, if no fuel, give it one last turn on the starter to move the engine a bit again incase you missed it and try the lever, if you don't get any fuel out by pumping that lever, replace the pump and that could very well be you.
If you have a big enough socket/spanner, you can turn the engine over on that - its more accurate.
The redex maybe chucked some gunk up through the pump, and knocked out a possibly ready to die lift pump.
What engine is it you have?