If you're on 0 TP now, I think I would wait until after 8th July to do TP run - this way you would get almost 2 years of your new status (and you still keep your bronze status until the end of August).
That LHR-HEL deal still seems to be alive through Kayak/TravelUp. It's slightly more expensive now at £330, but I think it's still great deal - you should be able to fly on A350 both ways, good lounges at both airports and nice weekend trip getting you 160TP. Link to LHR-HEL deal thread