Hi Steve,
There used to be such things as multi region VCR's but seeing as VHS has pretty much died in terms of formats, you'll have to hunt them down or find an older UK spec VHS machine that had the 'NTSC playback' function. Plenty of machines had that function which means you can bring your US tapes over, stick them in the machine and it'd output the video for a normal UK PAL tv to display. Have a look up on eBay to purchase one of those if needed. True 'Multi system' Video recorders exist(ed) as well, again, no real call for them nowadays.
i'd suggest perhaps converting the VHS tapes you have over there to a Computer format and then burn those to DVD, you could then sell off the VHS tapes themselves to collectors etc and then use the DVD's on a computer drive or on a normal DVD player.
As for your speakers working on UK stereo systems - there's no such thing as a 'british style stereo' - there are no standards or settings between the US and UK for audio components. However, if your speakers are of a high end design and may be bi-wired or require specific amplification, then do look into that a little more. If they're standard bookshelf/floor standing 4 or most usually, 8 Ohm speakers, you'll have no issues.
Cheers, DtM! West London & Slough UK!