Just had mine done by the RIB Service Centre in Southampton.
Not cheap (£35/hr) but not expensive either - good value I think.
Can also do tube repairs if you've got any peeling off bits.
Used them last year and the engine ran better than it had ever done - so have used them again.
Storm on this forum
www.rib-shop.com
02380 335333
Speak with Kieron
Regards
Duncan