What you probably want/need is a step-up transformer (110V to 220V/240V)... without seeing what you have, that is just a guess.
Something along the lines of this:
http://www.radioshack.com/product/index ... =107600130Apparently, you spoke to a clueless salesperson as according to the webpage these are available in-store and online.
Now, here's the important part - you need to know the power rating on the recliner before buying the transformer. That information should be somewhere on the recliner (maybe not - as I don't recall whether or not English law requires it to be labeled). In any case, the power can be calculated by motors that are installed. It may also have a transformer built into the recliner that could possibly be replaced.
The device above is good up to 150 watts according to the technical specifications. It may be sufficient for your use.
Call me if you want to know more...