that HH jacket will keep you warm and dry - it has PrimaLoft which is a superb synthetic insulating fibre, the warmest there is without paying for down. 5000 mm hydrostatic head is waterproof, not gore tex level but if it was then you'd be paying double - it's waterproof enough for dog walks and school run. £220 is a fair price I think, and it looks nice!
Didriksons does a similar parka called Celeste which retails around £150 - padded but not with PrimaLoft, I think water column rating of 2000 so less waterproof = in a 2 hr downpour you'll probably get soggy.