Looks like a reasonable and cheaper alternative to a new shock fo those who don't DIY...
http://www.ebay.co.uk/itm/TRIUMPH-TIGER-STEAMER-SHOCK-ABSORBER-SERVICE-EXCHANGE-WITH-WARRANTY-No-273-/261729141961?pt=UK_Motorcycle_Parts_13&hash=item3cf045c4c9 (http://www.ebay.co.uk/itm/TRIUMPH-TIGER-STEAMER-SHOCK-ABSORBER-SERVICE-EXCHANGE-WITH-WARRANTY-No-273-/261729141961?pt=UK_Motorcycle_Parts_13&hash=item3cf045c4c9)