After a long thought, I binned my order for the Hattons LL 66 and went for the Hornby. The money saved bought a tts chip (or three) and I got one of Richard's mega bass speakers too. As supplied, the speaker is an oblong one, a bit like their 67. Fitting a mega bass was mighty easy - tons of space in these basic locos.
First of all I had the speaker facing up but found it produced a sound much too deep - the body cavity probably didn't help. Fitting it face down was better, but still a little deep. Cutting a few holes in the chassis and sealing the speaker down with plasticine enhanced the treble massively and gave the model the right 'zing-zing' sound, with not too much bass and none of the hiss.
As supplied it is way too loud, but I was absolutely made up with the sound quality. I thought the 08 was good, but given a few tweaks, this is outstanding and it put a real smile on my face. And £25 in the antics sale!