Thank-you to everyone who replied. First time experience, very encouraging.
30cm of snow this morning in my driveway. No garage of my own so I'm a little restricted DIY. My wife tells me the front end sound is the same she heard when she got fleeced by Midas for new front discs and pads (that I had replaced at a local independant shop less than a month earlier). So my plan is (comments please) to return to Midas, tell them I think they fleeced my wife (I've got the barely used discs/pads they took off) and tell them they misdiagnosed the problem. At the very least I should get an alignment and a good look at what the true problem may be.
I don't think it is the CV joint, unless this sounds very different than my '93 Loyale - I've experianced torn boots and finished CV joints. In fact I'm almost surprised not to see the the boot torn when it gets up on a lift - yes I replace them promptly - cheaper than replacing a joint. At any rate it seems a finished joint would consistently make a noise whereas this noise, at last drive, was intermittent.
As for the high pitch sound I imagine it could be a belt. Could the two noises be related. The front end noise (not the high pitch) is almost similar to the 'ratchety feel' I get from ABS when my wheels want to slide, which I'm not sure is normal as I've never experienced ABS before.
I can't help but think that if I get no joy at Midas a once over by a dealer, particularly following the mtsmith's comments on proprietary computer stuff, might not be the best approach. Just how 'designed to be fixed only by dealers' are these cars anyways? My independant garage has little more than a lift, basic hand tools and a lot of scrap yard exeperience.
Again thanks for the feedback and please keep it coming.