The 22nd was a Saturday. The process would only have been started yesterday. There is no guarantee that the WHOIS database will be updated within 2 days.
It is unlikely that something has gone "wrong" with your registration. Check again at the beginning of next week and if things are still the same contact the place where you purchased the domain.
Remember written registration from Nominet can take several months so don't be looking for anything in the mail for a while yet.