Cancel unfilled buy orders on Friday to free up funds and earn interest.
Orders can be cancelled even after market closes on Friday.
Then resubmit your orders on Monday if wanted.
You’re not going to become a millionaire by doing this, but why not earn some extra interest.
This just wastes your time.
You earn interest on all uninvested cash.
Reserved funds are technically uninvested - yet.
Are you sure that even funds that are reserved for buy orders earn interest?
Are you sure that funds reserved for orders don’t earn interest?
One would expect you to have tested this and be 100% sure it works like you think it does before creating this topic.
I have tested it, but now I’m strating to doubt if I haven’t made any errors because Dougal says he still earns interest for reserved funds and I don’t know what I do wrong, but I do not … 
Will run another test
Will you include the search function on the forum in your testing?
Just in case, please see below for your research…
Yes, have a look here:
This community is so supportive 
…
Thank you very much!