I fitted this from Nippy Norman
http://www.nippynormans.com/products...n-tat-044-0563
Despite recent misgivings about poor service the said part arrived safe and sound in 4 days, one on my clocks had started to melt - rays through the screen I guess, so I bought and fitted the dash infill and the cockpit surround to give a bit of shade - together they also screen off the access to the rear of the clocks & tidies the dash up with a 12v outlet.
Took about an hour to remove the screen, fit both bits and reassemble.
You can get them direct from TT as well.
I do occasionally have to park up in London and out of sight, I usually put an oxford cover on as well - even in summer!