In short, I think you can’t go wrong with either Freetrade or Trading212. They’re cost effective and have a lot of choice.
Similar thread to one i responded in before so I’ll update my use cases now as some things have changed:
Dodl by AJ Bell LISA (per above post) replaced my Nutmeg LISA for this tax year and it’s going smoothly now.
T212 ISA - cheapest commission free broker with a few years operations under its belt and it’s a similar/more powerful version of Freetrade imho.
Plum GIA - easy to use and auto save into. I just use it now to dollar cost average into Tesla every month into the General Investment Account.
Still don’t have a SIPP but anticipate I will within the next 18months when I moved jobs and it will be with Freetrade.