Not a massive fan off T-cut as it needs to be used carefully so as not so leave marking to the paint. Do not use excessive pressure.

If you have this and want to use it though do a panel at a time and then go over the panel again using Autoglym Super resin polish and worked well should give the results you are after.

Finish off with a wax of your choice.

I would have offered to help you as Wales is a nice drive (went Abersywth (spelling) before christmas, you deffinatly got some nice driving roads) but got a Rolling road shoot-out this weekend.