Utilize your financial knowledge, give your answer or opinion to the input question or subject . Answer format is not limited.

Can one use Google Finance to backtest (i.e. simulate trades in the past)?
I've used yahoo to perform the exercise you're asking about. It allows you to download price data, month end if you wish, and by manipulating via a spreadsheet to add a column for purchases, you can easily see how your £100/mo would end after so long a time period.