Any carpentry or DIY help shop or service around my area?

[Frank15]

I would like to know if there's any carpentry service in my area for basic help, such as me getting a wood board for them to cut to a certain shape or cut corners or make a holes to size (B&Q won't do these more advanced jobs).

or maybe there's some online service for this?

I live in Slough (Berkshire, England)

Any advice much appreciated.