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I have a client who will be changing their domain name from www.brand.co.uk to www.brandglobal.com. There are concerns however that this might affect the searches for brand terms and variants. Hence, there is a suggestion for going for www.brand-global.com. I’m aware that search engines are smart enough to discern the brand name in most cases, but I’m wary if it would impact highly on the brand search terms and would it be a better option to go for www.brand-global.com instead of www.brandglobal.com? Any advice (or reference to discussions around this) would be much appreciated. Thanks

Shopping comparison(SC) sites work of a product data feed which is specific to every site.  So you've got two options

1. Create a data feed for every SC site you want to use or

2. Use a third party such as www.godatafeed.com who will take one feed from you and create the multiple specific feeds

Some SC sites have implemented a bidding system others use a fixed cost per click.  If you go for the first option you can use Analytics software to optimise your feed (optimise titles/descriptions to increase CTR, remove items which have high Cost/Conversion).  If you go for the second option, they will most likely optimise feeds for you.