Apologies for the delay.
Just taken a look, added some info to your support ticket and given our ops guys a nudge. Hopefully we can find out what's going on for you.
Edit: Looks like out outbound servers /can/ communicate with the recipients' which suggests there's no longer a problem?
root@avasout08:~# telnet mx-r1-lv.lailio.net 25
Trying 178.16.20.92...
Connected to mx-r1-lv.lailio.net.
Escape character is '^]'.
220 mx-r1-lv.lailio.net ESMTP Postfix (Debian/GNU)
ehlo relay.plus.net
250-mx-r1-lv.lailio.net
250-STARTTLS
250-SIZE 52428800
250-VRFY
250-ENHANCEDSTATUSCODES
250 DSN
mail from:support@plus.net
250 2.1.0 Ok
rcpt to:info@academicsummer.co.uk
250 2.1.5 Ok
data
354 End data with <CR><LF>.<CR><LF>
from:support@plus.net
to:info@academicsummer.co.uk
subject: Test email
Hi, This is a simple test mail, please do not respond.
.
250 2.0.0 Ok: queued as 05032140CB7
Are you still having problems sending to these two addresses?
