Some one who has had experience with those companies here will definitely put an honest review. But until then -Did you try testing their support? If not, you might want to give it a go to see how fast their response times are. You can also do a review research for both the hosts. Good luck.
As I know these hosts - rockhoster.com and hosting.uk - have the reputation of high and stainless companies.
Their support people are very attentive. I also have good feedback from visitors in regards to the server response time, which is most important for me. So far, everything seems to be meeting my expectations.
I have been using rockhoster.com for a long time and can say that the service and support are amazing.
Incredible support that answered to my 10 questions in an average of 10 minutes!
Very stable hosting.