From memory, the last deposits I made turned up almost immediately via the faster payment system. I made the payment directly to my standard account and then transferred across to the ISA from there.
I recall some direct payments to my ISA account taking much longer (a few days), but I think this was due to the fact that I needed to sign a new yearly ISA mandate, but the website didn't handle it well. It looked like all was OK when making the deposit, but the cash didn't appear. It wasn't until a couple of days later when I contacted Ablrate that they told me I needed to sign a new mandate. They sent me a link for me to sign and the money appeared in the account soon after.
I'm an equity investor in AxiaFunder and a minor equity investor in Welendus(FO), Brickowner, Crowdstacker, Proplend, ABLrate, CrowdProperty, Assetz Capital, Elfin Market, Qardus & Loanpad. This time next year I'll be a miwionaire Rodders!