Motorworks sell a oil filter removal tool. The early (upto 96) original drain bolt is different from the others. It has a very shallow head (prone to stripping - Thanks Pidcocks!) and if I remember correctly is 13mm. If you want the sizes just post the year of your bike and I will have a look. The final drive and gearbox filling points should be allen keys and are the same size as the larger allen key in your toolkit.
Thanks for that, I thought the drain plugs were Torx heads or similar but if they are straight allen bolts then i'm ok. As to the oil filter tool I found the answer (76mm) immediately afer posting my query.