A word of caution, Pete.
Unless the position has changed, some of the places selling Zeiss and Swaros might be selling gray imports.
If you buy a gray import there will be a problem if you ever need it repaired under guarantee.
A few years ago, when I was looking to buy a Swaro for my .308, the dealer told me he could sell me either a UK import with a full Swaro guarantee or source a grey import from Holland, I think, which would be a lot cheaper.
The difference was that if a problem arose with a gray import, the dealer could not send it back to Swarowski here in the Uk - I 'd have to send it back to the factory myself.
Because of the difference in price and the reputation for reliability I took a chance with the gray import and have had no problems.
An ex mate bought a grey imoprt which did develop a problem. He took it to an authorised dealer for Swarowski to repair but the UK office returned it saying that according to the serial number it had not been sold in the UK - so it seems that they do check!
Nick