Ok I have some problems and questions

[rsmithgs]

Weird that reinstalling Apache fixed it as dig is now displaying the following for admin.strawberrymilkshakes.co.uk

; <<>> DiG 9.4.1-P1 <<>> admin.strawberrymilkshakes.co.uk
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 42849
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 2

;; QUESTION SECTION:
;admin.strawberrymilkshakes.co.uk. IN A

;; ANSWER SECTION:
admin.strawberrymilkshakes.co.uk. 42828 IN A 91.121.134.106

;; AUTHORITY SECTION:
admin.strawberrymilkshakes.co.uk. 42828 IN NS ns2.admin.strawberrymilkshakes.co.uk.
admin.strawberrymilkshakes.co.uk. 42828 IN NS ns1.admin.strawberrymilkshakes.co.uk.

;; ADDITIONAL SECTION:
ns1.admin.strawberrymilkshakes.co.uk. 42828 IN A 91.121.134.106
ns2.admin.strawberrymilkshakes.co.uk. 42828 IN A 213.186.33.99

;; Query time: 954 msec
;; SERVER: 149.254.192.126#53(149.254.192.126)
;; WHEN: Wed Apr 16 18:50:42 2008
;; MSG SIZE rcvd: 134

So seems the issue (from what I can see) was DNS and that reinstalling apache was coincidental.

Would still check your NS2 though.