They were £35 a pop or so.

I then found 10 of 60mm long by 38mm wide 1.5mm wall thickness s/s plates. I'll 90 deg them in the vise at midpoint. I can easily achieve 15mm off patio for the timbers. If I've got the price right it will only be £8 or so for four vertical timber fixings. Plus they'll be hidden once cladding goes on and I'll have a cool floating effect.
I find it quite surprising how the apparently ancillary gear ramps the end bill up at a fair old rate! We've also bought a 32A DC IP67 rated breaker to inline between this 1.595kW panel Boot Room addition and the 60A rated 150V Victron solar charge controller. I'll test as I go but tbh we don't really need this string May to July and if it oversupplies I'll have an easy kill point while maintaining a dry roof.

Solar panels (roof) £250
Timber framing & cladding £175
Stainless fixing & assorted ancillaries £80
T seal £30
Postcrete(kingpost) £25
Wood preserver £25
Hand tools, mc4's & breaker £50
S/S mending plates £15
Total cost to date £650
Edit- Bought 10 of 90 deg s/s mending brackets. That should get it done and keep timbers dry at ground level.