In reply to ByEek:
It gets expensive if you don't re-use the old taps and if you do do that and cut holes for them, if you then replace the taps later, they may not line up and you'll have to buy another bath.
Also depends how much damage it does to the wall when you take the old bath out - they are often screwed to the wall with brackets that have corroded into a solid lump by now. Might also end up uncovering a load of water damage behind/under the bath and then the job really starts to snowball...
It it's an 80s bath, it's likely to be an Imperial length and a new one might well leave a gap at the end - as happened in my parent's bathroom.