Don't be too hype about the rilphone.dll version. If you flashed a new Radio and it worked, it works.
Dutty V3 does NOT come with Radio. It's pure OS ROM. That's the reason Dutty wanted you to flash the UK 1.56 stock ROM first - so you have the new Radio and new SPL, because its OS only compatible with new SPL.

So if you used HSPL 1.56 and flash Dutty V3, your current radio will NOT be overwritten. But since you have 1.13, so it's OK.

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Added on April 26, 2009, 8:17 pm

Good that it works for you.
HD Tweak... try a search in xda-developer forum... or is it included in the first post of this thread?

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Added on April 26, 2009, 8:20 pm

1.14.405.3 sounds like very old ROM.

Since you're getting stock ROM, try download directly from www.htc.com, key in your phone serial number, it will check if the ROM you (are going to) download is for your phone or not.

What about the time when I want to use GPRS/3G? Is it possible to re-enable?