I have the Sealey you mention, well kind of - it looks the exact same and I got it from Decathlon: http://www.decathlon.co.uk/velo-works-workshop-stand-id_8034462.html
£50, does the job and it is very stable. The clamping mechanism is not the best though and you need skills to hold the bike in the air while closing the clamp.
Apart from that, I think it is good value for money.
@Vince started
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I have the Sealey you mention, well kind of - it looks the exact same and I got it from Decathlon:

http://www.decathlon.co.uk/velo-works-workshop-stand-id_8034462.html
£50, does the job and it is very stable. The clamping mechanism is not the best though and you need skills to hold the bike in the air while closing the clamp.
Apart from that, I think it is good value for money.