I don't know any parcel forwarding company that accepts bitcoin but I use my local one and that's great, fast and cheap, would post but that company might not be usable for you. Well, my second favourite is myukmailbox.com also forward2me is good as far as I know.
leowonderful
I don't trust trustpilot reviews because for example they say bad on Asos but I order clothes from them for years and I really order a lot, never ever I had any problem but they have two star and very bad reviews on trustpilot. Better trust redditors...
Eh, there's not a lot of information on this site and I typically use Trustpilot for reviewing smaller sites. Larger companies I generally don't use Trustpilot for, and you can never be too careful when you're picking something like a reship where money and time can potentially be wasted if the service isn't reliable or outright steals your package (in some rare instances).
I also just noticed
Reship.com has started to offer UK addresses for their reshipping services, and I've never had any problems with 'em. Just be ready to do verification if necessary, as they do occasionally ask for an ID, but that's about it.
Here's the link to Reship.com's shipping cost estimator if you're interested in pricing for their services.