plaguedbyfoibles wrote:If I set up a Stocks and Shares ISA account with Vanguard, I presume the only fees that I will be paying are the annual platform management fee, which is deducted from my account at regular quarterly intervals, and ongoing charges (OCF), fund management fees paid to Vanguard
The latter is indirect: it comes off the performance of your funds, it's not something you pay for directly as a £ cash debit out of your account.
and that the ISA wrapper shields me from all other charges, including transaction costs (which I believe consists mostly of share dealing charges and Stamp Duty Reserve Tax, the latter of which I believe is not chargeable on ISA accounts)?
Transaction costs are also indirect, but an ISA certainly doesn't protect you from those. As for stamp duty, ISA accounts definitely do not protect you from that, however most Vanguard ETFs are domiciled in Ireland so stamp duty doesn't apply, but it's nothing to do with ISAs.
I presume my primary concern should be fund performance, whereas my secondary concern should be the fees.
LOL!
Some would say that you have no control over performance but fees are something (the only thing?) that you do have control over. You should ask that question on the Investment Strategies board! You know the old saying that if you have 100 economists in a room you'll get 130 opinions? Well it's much the same with Lemon Fools on this topic!
plaguedbyfoibles wrote:What is the philosophy behind pound cost averaging?
There are two. The mundane one is that many (most?) people only have the ability to save a relatively small amount out of their monthly salary, and it makes sense to get that invested ASAP, so simply put in the same amount each month and buy how ever much of your chosen shares/ETFs/funds/whatever you can with it each time. The other is that it's very difficult to time the market so, if you have a lump sum and similarly invest it in dribbles over a period then you'll avoid going all in at a market peak.
However, some studies have shown that statistically, on average, as markets generally go up over the long term, it's better to bung the whole lot in in one go. Although that expectation wouldn't have helped the nerves of anyone that did so at the 2000 or 2007 peaks in the following few years! OTOH you could have £ cost averaged over the relatively flat 2018-19 and then been hit with the covid crash anyway....