TP runs out of London are not really a thing, there’s the odd opportunities but less often. There was recently a travel agent option to Helsinki which would have suited you, but I think that’s now gone. Can you make use of the double TP holiday offer again to book something. In the TP run thread the wiki highlights the 80TP routes which are obviously a good starting point. HEL to AGP and LIS I think are 140TP routes, but availability is scarce.
Check the low fare finder in business, maybe this is most easily done through a series of returns to Jersey, Dublin or another relatively quick short haul destination where you can fit a few in.
If you price it up, I definitely recommend a sanity check at that point. Does Bronze offer you enough to spend x GBP and time getting it, silver makes more sense, but we all have our own motivations so not for me to say. If you don’t fly enough for need, then TP runs are a bit pointless to gain benefits you don’t use. Could you perhaps better use the money to fly business when you need and get lounge access/checkin upgrade that way.
Good luck finding what you want, and welcome to FT. Stick around, you learn so much. I’ve benefitted a huge amount from the knowledge and help posters here provide, so I’ll also say a quick thank you to all the usual suspects that provide such great advice.