McDonald's meals with a WHSmith purchase for £1.99 - doesn't include drink
Note - it says not valid at restaurants with a drive-thru, but I've used them at restaurants with a drive thru plenty of times before. Also, the expiry date doesn't mean much. The staff never look at them, still accept them if expired, and expired vouchers will still scan on the self order machines (from my experience)
There is a breakfast voucher but I gave it someone else and forget what it is, sorry.