T212 get their ask/bid quotes supplied by Bloomberg.
If you are talking Invest/ISA then the spread is identical, this isn’t touched by the broker.
Also be carefully when comparing T212 to TradingView, as you’re looking at the ASK vs trades.
The ASK is what is being asked to buy.
The trades are what was actually paid or received from selling.
So T212 can pulls through the latest ask of 10p (this is just indicative), and if the deal is done at 9.8p then thats what appears on TradingView.