In case anyone's interested, here's my list so far of Toppy differences to the Twin. IMO if these were solved it would significantly increase the ease-of-use. (I'm using the latest 5.12.88 firmware.)
I'll try to pursue them individually (time-permitting) on the
www.toppy.org.uk forums (since they seem to have a wider audience) and report back here periodically.
I did try out the MyStuff TAP (and eit2mei). Although it seem sto be potentially very powerful, I found it very complicated and still couldn't get the basic Info display right

will pursue that on the toppy forums also.
General operation
No View Subtitles toggle button - instead 6 remote button pushes are req'd!
Instant record button doesn't display any info on screen - just 'rECo' on LED panel. Channel number disappears.
Instant record should record current prog by default, rather than a 2 hours slot. Have to push rec button again and select when to end recording (rather unintuitive)
FFwd displays % progress indicator rather than elapsed time
FFwd only goes to up to 6X and then goes to normal playback on the next press. Pace goes to x64 and then cycles through to 2x. Ditto for Rew (except it only goes up to 3x)
Playback of recorded prog has blank audio at start
Play doesn't resume the last played back recorded programme
Info button
Info only shows Now program info, not Next. Also doesn't show current time clearly. Design needs improving to include Next title and ability to switch to show Next's details.
Pressing Info during recorded prog only shows played progress % for a few seconds. Prefer progress bar and time indicator instead. (This is actually shown when Play button is pressed, although only the elapsed time and not the total)
Signal strength/quality bar graphs aren't as readable or easy to compare as figures
EPG/Info
Confusing refs to "Service" instead of programme e.g. "Recorded Services"
EPG - 'OK' button - what does 'preselect' mean (vs Record)?
EPG layout needs improving
Delete File confirmation Y/N dialog doesn't actually say that it's deleting a file!
Recorded Services screen doesn't mention programme length in table (it's only shown in prog details)
Ditto doesn't indicate if prog has been watched
Free disk space is displayed in MB rather than hours/minutes
No auto pad for timers (TAP available)
No apparent way to skip fwd or back by 1 minute. (TAP available)
EPG shows truncated programme info.
Hit Stop whilst Recording and "Stop Recording" dialog isn't clear about which option is being highlighted (need to examine tick boxes)
Bottom half of EPG screen sometimes missing
Live pause
No indication on box of live pause playback activity. Pace has Rec and Playback LEDs. Have to press Play on Toppy to check status (counter-intuitive)
Live pause - changing channels loses live buffer. Pace has protection against this "Exit live pause mode before changing channel"
Live pause resume has blank audio initially
Display
Leading "P00" prefix on LED panel is superfluous.
Add status indicator characters: R for recording, L for live playback. P for recording playback.