autopilot_off - the standing agreement you would have been on is FL130 level GWC unless the TMA is holding high and ask for you to come in at a slightly higher level to help out. Freq 127.825 would have given you the descent to FL130 and then transferred you to 133.175 as you approached GWC. The SLP is GWC where, unless otherwise instructed, you should be 250kts anyway. I'm glad you came back to 220kts however the controller should have reiterated the speed when they gave you the second instruction.
Are you based in the south UK? A trip to Swanwick can certainly be a benefit
