Welcome to the club Scott, sorry to hear about your mum.
Faq section has plenty of info and links to all your questions, but dont hesitate to ask to clarify or require something thats not listed.
As Gary posted above, the speed chime is standard on imports and is a little black box located to the left rear of the dash binnacle, remove the two screws under the hood of the dash, lift off the top and you can unplug the box. This will also lose the lights left on bong, but better than it getting on your nerves at speed lol.
There are speedo convertors to get rid of the chime, convert speedo to mph, but can also affect power steering by tricking the ecu into thinking its going slower, alternative is to get hold of a UK set of clocks, which will eliminate all together and read mph.