UK Magento Hosting is not easy to choose, the problem is not just come from the provider but come from the customers. Why I say that? For example: provider 1 local in UK have 100 customers and another global provider have 1 000 000 customers then which one do you think better?
I bet with you that the one who have 1 000 000 customers will provide you the best services, because they have a lot of experience how to make magento site work best and how to fix the normal problems (I can say almost problem you meet they already met), so almost your magento support needed will be served quickly by the best result.
So I guess you know why.
My experience is when you choose a magento hosting provider, they must have:
- Magento hosting package configuration: what they invest to configure server for magento only to get the best performance
- Magento support: of course very neccessary since almost customers will need help
- Security: they must take care the server security for us
- Speed and location: they should have a better caching system more than file caching system (slowest caching) and their server near your customers as much as possible.
So, in UK you only need server in Europe then it should be fine enough. After all I recommend
SiteGround magento hosting who got everything you need and have server in Europe. They provide supercacher with cache server and memcache what help you lot for your site.
Hope it help you.
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