When you submit your next SNOWTAM please email the UK NOTAM Office (notam.proposals@nats.co.uk.) informing them of your submission, they will confirm receipt or provide further advice.
If you require further assistance the UK NOTAM Office can be contacted H24: 01489-612488 / 01489-612489.
The issue above is only affecting SNOWTAMS, NOTAMS are unaffected. Please share this with your ANSP if they submit SNOWTAMS on your behalf.