Peter has already covered most the points; and you know of the trial and tribulations of going further on the build thread for me
.....
Either way that said, the MAF sensor is the main weak point, roverron no longer does a MAF, but we can get pierburg replacements ow with the IAT for less than an OE Bosch MAF, .org has a few threads with cars that use the same sensor number, so you can just buy the new vauxuall or alfa housing and switch the maf into ours.
Other thing to go is the Intercooler hoses. it is not a case of if, but when. OE ones are about ?40 per pipe prob a bit more now that VAT is higher.
I think there is a thread that stamford wrote up from some info i gave him..... but really i would say ave a read of the derv section on .org (as i know you are on the forum anyways).
other than the engine itself all the same issues are there that would affect the 180, eg rust patches and blocked drains etc...