help tracking ford escort, please

Hi, I have a Ford Escort 1.4i 1993 L Reg.
The problem is Ive just noticed one of my tyres being bald three quarter the way a across. The thing is Ive only done 1500 miles since my last M.O.T and
when i got that done i also replaced the bottom wishbone bushes, could this make my tyres go bald if fitted wrong. Im going to get the tracking done, but the extent of the wear I think its more serious, any ideas. I run the car for a while when the tracking is done (cant afford to waste money on keep replacing tyres) Any way have you any idea what the problem could be ? and is it fixable at a reasonable cost, would get a garage to do the work.
Thanks in Advance
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