First UC Trip

Hi- this is my first posting on here although i am a frequent visitor to the site. I am flying on on March 15th from ewr to lhr on vs 18 in economy and was wondering if anyone had any thoughts on that flight. I usually take flight 2. Is 18 easier to manage jetlag? Also is anyone else flying that day in UC? I was able to use the lounge 2 years agao when I went with my friend who was flying upper. Also, on my way back I used miles to upgrade to UC on Vs 17. This will be my first UC flight. I was wondering what to expect etc? How do I go about pre-booking a treatment in the CH? I have heard a lot about the club house. How much time would you reccomend? Thank you for all your help![:D]