Rosa, you are giving the cheapest price (180 GBP) for a custom made frame, right? If so, custom made frames (or custom made anything) will always be a premium.
Any frame that you have made to a specific size, frame style, etc., including the one I mentioned above for $60, is "custom made." If you want a really fancy molding, matting, museum UV acrylic, etc., that stuff will surely be more $.
Vick was saying that the one he got was "very basic matting, framing, etc.," and I'm always shocked at how much some frame shops charge people. I just figured I'd throw my $0.02, regarding shopping around for the best prices from local shops and/or online.