As nominet have today started providing DS data records for DNSSEC delegation of UK domains to name servers, we now support this.
To make use of this you have to send support the exact dsdata records you require adding to your domain. Staff will most likely call you to verify what you are asking to be sure, or to check your PGP fingerprint.
You need to understand DNSSEC properly, and have the means to set up a zone file correctly otehrwise things are likely to break. If we find customers have issues we may set up a test domain that we can delegate to you to test your DNSSEC fu.