Doctor Who fan solicits Abu autograph

An interesting fan letter from 2005 found among a collection of TV memorabilia. A very polite and thoughtfully composed letter from an ultra-keen collector of 'The Doctor.' He even goes as far as enclosing a pen, a good idea for an autograph hound on the street but unusual in a soliciting letter (surely?). 850 autographs is pretty good going...could only find one photo of Terence Brown in his role as Abu. By the way the factoid about the early use of dry ice sounds convincing but how true is it?

Dear Mr Brown

I am writing in the hope that you can add to my collection of Doctor Who autographs.

If possible, I should be grateful if you would sign the enclosed cards, which relate to the Doctor Who story The Krotons in which you appeared as the doomed Gond  student "Abu."  His death at the hands of the croutons  was one of the first major uses of dry ice in television drama, and was the catalyst for the Doctor and his friends becoming involved in Gond society. Also enclosed is a pen, which should help with signing certain cards, and a return envelope with sufficient postage for both the cards and a pen.

Of course, I appreciate that Doctor Who is only a very small part of your career, and that you make the firm not to sign certain cards, but I should be grateful if you would return them in any event.

Terence Brown as Abu

Please could you also let me have a signed photograph. I 
have made one using images from the Doctor Who website, as I realise you may not have any available, but please accept my apologies for the quality. I much prefer a signed picture of the actor, rather than their role in Doctor Who, so I should be grateful for a current photograph if at all possible. These items are solely for my personal collection of over 850 actors and crew from the programme, and I'm quite happy if you would like to dedicate them.

The Krotons is one of the Doctor Who stories for which I have only been able to obtain a couple of autographs, most recently from actor Gilbert Wynne.

I do hope that you will find the time to reply…