I can’t believe no one else has commented on this. I was just about to make a post requesting this feature when your post came up as suggested. I have the same issue too, especially when I’m trying to transfer an irregular amount to cover say a bill, and I then have to remember what the amount was that I was transferring.
Also, I’m not sure why it needs to default to £50? Why can’t it be left blank for us to fill in as required? It’s pretty rare that I need to withdraw exactly £50. That would also make it that little but quicker for us as we don’t need to delete the 50 from the input field. I also think being able to put the numbers in like when using paypal makes everything a bit quicker, like this:
Say you want to withdraw £6.84
Press 6 = £0.06
Press 8 = £0.68
Press 4 = £6.84
I obviously can’t speak for everyone but I much prefer that way and it makes everything a little bit quicker as you don’t need to press the decimal point.