Voluntary work for a UK charity

[Mike H <newsreader@ada-augusta.demon.co.uk.INVALID>]

Good day ladies and gentlemen.

My initial Ada experience was in teaching and later, for real, in among 
the usual suspects (Nuclear Power, Air Defence, etc.) But all that was 
before I retired ten years ago and I haven't written a line of code 
since. Now my past has caught up with me and I have been asked to return 
to the 'code face'. The work is on behalf of a UK registered charity and 
the application is relatively simple (a variation on the theme of a 
road/rail crossing). Why Ada? When completed it will have to be passed 
by the UK Railway Inspectorate.

For the moment can anyone suggest a doorway toward a low cost (or free) 
language syntax checker with which to refresh my memory? The code 
generation can come later and will, hopefully be the GNAT tools.
-- 
Mike Hopkins