I'm usure about where you can purchase one in the UK... (I'm in the US) Charlie_PS2, Dust2Dust, or PSXPaul can probably tell you where to get them..
The main difference between the A04 and A05 is speed. Take a look at a post I did a little while back on the A05... It shows the difference between the two.
Pioneer DVR-A05 specs page! 
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[COLOR=blue][B]**V5 PAL** SCPH-30004 R W/[/COLOR][COLOR=red]Messiah[/B][/COLOR][b][color=blue][/b][/color]
[color=blue][b]**V7 NTSC** SCPH-39001 W/ [/color][color=red] Messiah 2 [/color][color=blue](Installed by My M8: [/color][color=red]Dust2Dust[/color][color=blue])[/color][/b] :)
[COLOR=blue][B]Pioneer DVR-A05 [/color][color=red] (FW 1.30) w/2X Ritek hack![/color][/b] :D
[b][color=blue]Lite-On LTD-166S DVD-Rom W/[/color][color=red]Smart-X[/color][/b]
[COLOR=blue][B]LG GCE-8320B W/[/color][color=red]8MB Buffer[/COLOR][/B]
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