I have not dealt with them before, but they have been going since 2002 so I can only presume that they are ok. Might be worth a phone call to them and see what they sound like over the phone - you can always ask them about this lens and if you feel happy with how they are talking then you can place a order, if you are not happy then you can always put the phone down. Below is the info about the company website.

Domain name:
microglobe.co.uk

Registrant:
Habib Khawaja Abdul t/as London Camera Repairs

Trading as:
London Camera Repairs

Registrant type:
Unknown

Registrant's address:
3, Galen Place
London
WC1A 2JR
GB

Registrar:
Nuco Technologies Ltd [Tag = HOSTIT]
URL: Web site hosting uk - windows and linux mysql and ms sql server 2005 website hosting asp.net

Relevant dates:
Registered on: 18-Nov-2002
Renewal date: 18-Nov-2008
Last updated: 05-Nov-2007

Registration status:
Registered until renewal date.

Name servers:
ns1.srv.host-it.co.uk
ns3.srv.host-it.co.uk

WHOIS lookup made at 21:27:11 06-Apr-2008

--
This WHOIS information is provided for free by Nominet UK the central registry
for .uk domain names. This information and the .uk WHOIS are:

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Beacon Images - last updated 29th June