Ryobi planer not switching on .think it may be the switch?power to in side of switch.Where can I get ryobi spares/parts in UK thanks

There are over 40 variations of the B&D planer, there will be four or five screws holding the two parts of the body together, take phots as you go then you can put things back in reverse order. If you want parts try https://www.toolsandpartsdirect.co.uk/spare-parts/black-decker-spare-parts in the UK. good luck, it's not too difficult.)

Unfortunately you do not say what country you are in but the link may help
http://ryobi.custhelp.com/app/support/answers/detail/a_id/9/~/ryobi-spare-parts

check the motor for a thermal over load button
to stop it over heating take more lighter cuts as the motor is a small motor compared to what the cut can be

may need new bearings this is a link for all spares
http://www.ereplacementparts.com/ryobi-ap1301-surface-planer-parts-c-7931_7939_7941.html

This is the closest one I could find, hope it helps!
http://powertool.manualsonline.com/manuals/mfg/ryobi/hpl51.html

I think you mean AP1300. 13" ryobi planer?
If so, you can go to this site: http://www.ereplacementparts.com/ryobi-ap1300-portable-planer-parts-c-7931_7939_7940.html Click on diagram/page E and see item 20.

You can get parts and diagram here.

http://www.ereplacementparts.com/ryobi-ap1301-surface-planer-parts-c-7931_7939_7941.html

It is fixable if you are technically competent. All parts are still available online. It could be one of two problems:

1 - The rollers are driven by two gear & chain mechanisms on the height adjuster side of the unit. I did have a drive chain break once.

2 - If it isn't that than the gearbox has cracked / gear stripped under the torque load. This is also fixable, each individual gear and the gearbox housing are still available (10-09), but it requires substaintial teardown.

As you disassemble the unit just be careful once you remove the crossover height adjuster shaft - you don't want to turn one lifter by itself and have the planer higher on one side. It really is a simple teardown, just lots of parts. If you like the planer it is worth it; parts are cheap. If you are like me, you enjoy tearing stuff down to see how it's made and you hate throwing out $200 tools because only one little part broke!

Planer blades L-120N available on ebay from User ID:byarose2005