Quick question: I have some delay repay vouchers to use up, which can't be used for on-line booking. Can I use them to buy advance tickets at a ticket office, or are advance tickets on-line only?
True, though any vouchers issued by East Coast can be exchanged for e-vouchersThe disadvantage of this unfortunately is that some operators e.g. East Coast offer online-only discounts on Advance and other fares.

True, though any vouchers issued by East Coast can be exchanged for e-vouchers![]()
You can use them at a booking office if you wish, for any ticket sold at a booking office, including Advance tickets.
Another option that members have reported some success with is using them through First Great Western telesales, which will ask for a debit or credit card payment for the full amount of your booking, and then refund the value of the vouchers when they receive them from you by post.