I wouldn't bother with tyreleader.
After 8 days of 'checking' to make sure I wasn't lying they have agreed to collect the wrongly delivered rear tyre.
They won't be delivering a replacement as they are 'out of stock' despite showing on their website as in stock albeit with a £20 increase in price.
I've asked them to collect the front as well as I have no use for just a front tyre but apparently that is not possible. I may have to have a chat with the credit card company.
I've had to chase every day to get infrequent replies on their support system and most of those are just thank you for your patience crap. If it goes wrong with this lot you've had it it seems!
Phil