Can anyone help me with a problem with my Triumph

[Scotty4545]

Put a jump lead from the engine block to the negative terminal.
This will give a direct earth.

Also make sure the connections on the positive are good, as have seen dodgy starter solenoid connections give issues, especially if had starting issues before.

Might even be worth putting a screwdriver/jumping the starter solenoid just to confirm not burnt out inside

Would the smaller connections on the solenoid cause any issues? The large terminals are clean and I also have a direct engine ground but the smaller connections on the solenoid which I assume are to just energise the solenoid are a little lose.
I will try jump with screwdriver but this freaks me out a bit I'm useless with electrics and don't want a shock haha

[Scotty4545]

All the things suggested are possible. Eliminate earth issues as per Ruffian's post then work your way through. I would suggest a proper drop test on your battery. Most are pretty awful quality I've just gone through three battery warranty claims on a works van with supposed premium battery, all shite. Worth trying a direct earth from the starter motor to the frame as well.

Whats a drop test and where would I find a place that does them?

[Scotty4545]

Absolutely buzzing with the amount of replays and new suggestions to try thanks everyone. Will be working on this over next few evenings fingers crossed we get it sorted thanks again!