Hi, looking for some advice.
I'm new to these vouchers. I'm not looking to use for a while. Have my first one and waiting until next year to get second one and then will be looking to book a long haul return for 2 in 2027. However, I have a few questions.

1) I had a little play with the one voucher I have to see how easy it might be to use. For some reason it only shows Economy and Premier Economy in the drop down menu on the search screen when I select the "use BA Barclays Cabin Upgrade Voucher and Avios" option. But, will show Business if I select "Book with money and upgrade with Avios" is this a known issue or am I doing something wrong?
2) Trying to find return availabilty seems to be pretty hard given you have to wait for both the outbound and inbound flights. Are there any tips for routes from London (e.g. using something like subscription sites like seatspy)? We can be flexible on dates/day of the week. Just want to be able to go a decent distance to get value from going Business class for a 10-14 days holiday destination again flexible of destination as I know very popular places will disappear quickly. Or I am really needing to think about just booking one way out when available appears and use another method for the return journey given the rules on use needs to be from the UK?