If you would like a signed copy of The Angels of L19 with a personal inscription, you can get one by ordering from my local bookshop in Glasgow, Outwith Books, and they will put it aside for me to sign before posting it on. The signing is free, but there'll likely be a postage charge from Outwith in addition to the cover price of £10.99. UK only I think.
Write to Natalie at orders@outwithbooks.co.uk, and let her know you would like it signed, and who you would like it addressed to.
If you just want a simple signature, Topping Edinburgh also have signed copies.