Checking their website gives the geographic number for D-Link as 020 8955 9000. However, I assume this is just the switchboard for D-Link at their headquarters (also listed on the site). By the look of the number, D-Link possibly own most, if not all, of the 9000 range (their fax is 9002) so anybody with *loads* of time on their hands could try the numbers.

My advice is ring the switchboard, see if they can transfer you to technical support (make sure to 141 the call though).

James

I've tried some numbers. My findings are:

020 8955 9xxx

9000-9045 various, some with personal voicemail messages, some answer as 9000 does; none are same as 0845

9200 Intra-Tech Healthcare
9321 Brakes old customer service number. Has message redirecting to 9350
9400 Unilever Peoplelink
9470 Unilever Marine Support
9480 Unilever Marine Support
9489-9493 Unilever Marine Support
9494 Unilever Peoplelink Emergency
9499 "No agents are available" No clue as to what company it is.
9997 Brakes customer services
9999 M&J Seafoods (part of Brake Bros)

You could try numbers 9051 upto 9199, as it appears higher numbers don't belong to D-Link.

Validated as of March 2016. 

0203-499-5964 = D-Link Tech Support department answer machine with further options to route to specific staff.  


Press 1 for Q's on D-Link devices from ISPs like Talktalk or virgin
Press 2 for tech assistance on home solution products 
Press 3 for tech assistance on business solution products
Press 4 if you're a reseller with a product question
Press 5 if you're looking purchase a product & have a question
Press 6 if you have a warranty question and already have an RMA number