Which platform

[Cokehead]

Currently with HL and have about £120k ISA and a similar amount in a Sipp, a mix of funds and shares. I put £20k in my ISA every year and about £15k in my pension (paying in and dealing about once a month).

HL's fee is 0.45% which is quite high. I wondered if anyone could recommend a cheaper platform? Anyone use Interactive Investor?

Monevator has a page comparing them all. There is normally a tipping point where flat fee becomes a cheaper option

monevator.com/compare-uk-cheapest-online-brokers/

InvestEngine is pretty good.

I started watching DamienTalksMoney on YouTube thanks to a mumsnet recommendation. He's brilliant! Here's a video on your question:

Interactive investor is good. It's a monthly flat fee which would probably work out cheaper for you.

www.comparefundplatforms.com